improve FAQ 5.6, thank Cody for finding broken links

The question for FAQ 5.6 was improved to be more compact
while addressing both broken and wrong web links.

Removed any direct reference to drugs in an effort to
avoid problems from those who are humor impaired,
as well as "bots" to might flag the site as connected to drugs.

Moved the reference to the tool used by Cory to find
broken links to the thanks page.

faq.md

@@ -57,7 +57,7 @@ other inconsistencies with the original entry?](#faq4_3)
 - [5.3  - How may I report an IOCCC web site problem?](#faq5_3)
 - [5.4  - How may I submit a fix to the IOCCC web site?](#faq5_4)
 - [5.5  - How may I correct or update IOCCC author information?](#faq5_5)
-- [5.6  - I found a dead or invalid link. What should I do?](#faq5_6)
+- [5.6  - What should I do if I find a broken or wrong web link?](#faq5_6)
 
 ## Section  6 - [Miscellaneous IOCCC](#faq6)
 - [6.0  - How did an entry that breaks the size rule 2 win the IOCCC?](#faq6_0)
@@ -1906,11 +1906,11 @@ against the master [branch](https://github.com/ioccc-src/winner/branches)
 of the [ioccc-src/winner repo](https://github.com/ioccc-src/winner).
 
 
-## <a name="faq5_6"></a><a name="fix_link"></a>FAQ 5.6: I found a dead or invalid link. What should I do?
+## <a name="faq5_6"></a><a name="fix_link"></a>FAQ 5.6: What should I do if I find a broken or wrong web link?
 
-If you just wish to report the issue, see [FAQ 5.3](#faq5_3).
-
-If however you wish to fix it you may open a GitHub pull request as described in
+We would appreciate if you try to fix the broken (the link goes nowhere) or wrong
+(the link goes to something that clearly is not the original intent) web link.
+If wish to fix such links, you may open a GitHub pull request as described in
 [FAQ 5.4](#faq5_4). In the case of dead links or invalid links it doesn't matter
 if it's a specific winner or not; the procedure is the same: open a pull request
 to fix the problem.
@@ -1918,36 +1918,39 @@ to fix the problem.
 As far as how to find the updated link you can try using the [Internet Wayback
 Machine](https://web.archive.org) and see if you can find the last non 4xx non
 3xx page. Note, however, that just because it redirects, does not mean it's not
-valuable. Some links were changed to more recent URLs by doing this exact same
-thing. Other times you might find it with a web search. It isn't always the same
-process.
+valuable.  Other times you might find it with a web search.
+
+Some links were changed to more recent URLs by doing this exact
+same thing.  Some links, while they real a valid web page, no longer
+reach the intended web page (for example when the domain is sold
+and the new domain owner's content no longer provides the content
+that was originally intended.  And while the content of the web
+page may be humorous to some, the original content may have literally
+gone "up in smoke".
+
+In cases where the original content is lost, try searching for it on
+the [Internet Wayback Machine](https://web.archive.org).  When searching
+look back for dates that are around the year of given IOCCC contest.
+If you do find the original content in Internet archive history,
+please consider submitting a change to replace the link accordingly.
 
 If there is no alternative that you can find you might want to remove the link
-instead.
+instead by replacing the link with just phrase of text.  For example,
+if the text in some `README.md` file was:
 
-Once the update is in place you can then open a pull request as described
-earlier.
+```
+See the [author's description of the program](https://example.com) for more information.
+```
 
+Assuming that the author's description cannot be found in the
+[Internet Wayback Machine](https://web.archive.org) archive, then
+replace that text with:
 
-### What is an invalid link?
+```
+See the **author's description of the program** (sorry the content is no longer available) for more information.
+```
 
-A classic example is that of Stephen Sykes's domain which had expired and then
-bought again by a drug dispensary company. If you're more curious than that (or
-maybe want a laugh :-) ) see commit b4e480a7cf6ef5e3c072f00d59daf12a394faede. In
-any case obviously this had to be fixed and this is an example of an invalid
-link albeit an extreme one.
-
-
-### A general note about fixing links
-
-It should be noted that although many links have been fixed, many will not be
-fixed. Cody Boone Ferguson created a script that detected many dead links but
-it's not perfect and there are just too many to go through, especially as it is
-a very laborious task to copy and paste all the links into the Internet Wayback
-Machine and even more so because even if it appears okay it does not mean it
-is okay so every link would still have to be checked (an example of why this is
-is given above). It is more useful to fix links to pages/files in the IOCCC
-website itself.
+If you just wish to report the bad link issue, see [FAQ 5.3](#faq5_3).
 
 
 ## <a name="faq6"></a>Section 6: Miscellaneous IOCCC

thanks-for-help.md

@@ -4399,6 +4399,16 @@ typo/consistency fixes, improving **ALL _Makefiles_** and writing
 for your extensive efforts in helping improve the IOCCC presentation of past
 IOCCC winners and fixing almost all past entries for modern systems!
 
+Cody Boone Ferguson also used one of his own tools to detect many
+dead links.  While the tool was not perfect it went a long way
+to uncover a good number of bad, broken or otherwise invalid links.
+It was a very laborious task to copy and paste problematic links
+into the Internet Wayback Machine in an effort to try and find
+otherwise lost content.  A good number of links that now refer to
+something in the [Internet Wayback Machine](https://web.archive.org)
+archive replaced bad, broken, or otherwise invalid links thanks to
+Cody's efforts!
+
 
 ### <a name="yusuke"></a>Yusuke