fix more broken markdown links

Fixed stuff we broke by mistake, previously.

Ran `make www` to perform the above.

TODO: Fix stuff we broke by mistake doing the above.

TODO: Fix more broken markdown links.

thanks-for-help.html

@@ -2888,7 +2888,7 @@ the prototype being included).</p>
 <p><code>main()</code> also called itself but this was a problem so it now calls another
 function <code>poke()</code> which calls itself instead (this is sometimes necessary
 nowadays and other entries had to have this same kind of change,
-<a href="/2001/anonymous/index.html">2001/anonymous</a> being a good example).</p>
+<a href="2001/anonymous/index.html">2001/anonymous</a> being a good example).</p>
 <p>Finally the optimiser cannot be enabled so the compiler flags were changed for
 this, forcing <code>-O0</code>.</p>
 <div id="2004_gavare">
@@ -4617,7 +4617,7 @@ it is <code>$(MAKE)</code>.</p>
 <a href="var.mk">var.mk</a> file and removed another that was deemed problematic or
 undesired. Other variable names had typos in them.</p>
 <p>In at least one case, like the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/Makefile">top level Makefile</a>, where raw
-commands that are in <a href="/var.mk">var.mk</a> were used, Cody updated them to use the
+commands that are in <a href="var.mk">var.mk</a> were used, Cody updated them to use the
 variables.</p>
 <p>A comment was missing for the <code>diff_alt_orig</code> rule in all the Makefiles and
 this, along with many other fixes and changes to the Makefiles were made by