Improve markdown guidelines wording

Amongst the changes here is that we do not need to have the hex or html
code (numbers) for open and close parentheses (in links) as there are
names. '(' is & followed by lpar; and the ')' is the same but 'rpar;'
instead. This makes it easier to remember and type and it generates the
same html as well (they are all valid). Now the markdown files are
consistent in this (in some cases hex was used and in others the html
code).

Although many markdown files were updated no html files needed to be
updated as it generates the same html. Even so I ran the appropriate
rules to do so just to verify this.

2020/ferguson1/gameplay.md

@@ -14,7 +14,7 @@ for the input keys.
     *   [Playing the game](#playing)
     *   [Walls](#walls)
     *   [Cannibalism](#cannibalism)
-    *   [Stretching (shedding)](#shedding)
+    *   [Stretching (shedding)](#shedding)
     *   [Winning](#winning)
     *   [Quitting](#quitting)
 
@@ -23,10 +23,10 @@ for the input keys.
 
     *   [**Photosensitive epilepsy/Stimulation overload trigger warnings**](#warning)
     *   [Drawing / Practice mode](#drawing)
-    *   [Computer playing / Automatic mode (Photosensitive epilepsy/Stimulation overload trigger)](#auto)
+    *   [Computer playing / Automatic mode (Photosensitive epilepsy/Stimulation overload trigger)](#auto)
             *   [Variations](#auto-variations)
-    *   [Grow-Shrink (Positive/Negative Winning) mode](#grow-shrink)
-    *   [Hypnotic / Sleepy mode (Photosensitive epilepsy/Stimulation overload trigger)](#hypnotic)
+    *   [Grow-Shrink (Positive/Negative Winning) mode](#grow-shrink)
+    *   [Hypnotic / Sleepy mode (Photosensitive epilepsy/Stimulation overload trigger)](#hypnotic)
     *   [Stimulation / Calming mode](#stim)
     *   [Other ideas](#other-ideas)
 
@@ -44,7 +44,7 @@ for the input keys.
     * [GROW / SHEDS         -   Growth / Shedding sizes](#growth)
 
 
-7.  [Conclusion (and inspirational words for everyone)](#conclusions)
+7.  [Conclusion (and inspirational words for everyone)](#conclusions)
 </div>
 
 
@@ -728,7 +728,7 @@ are called Grow / Shrink).
 
 
 <div id="hypnotic">
-## <a href="#toc">Hypnotic / Sleepy mode &#x28;Photosensitive epilepsy/Stimulation overload trigger&#x29;</a>
+## <a href="#toc">Hypnotic / Sleepy mode &lpar;Photosensitive epilepsy/Stimulation overload trigger&rpar;</a>
 </div>
 
 **Photosensitive epilepsy/stimulation overload trigger warning:**
@@ -892,7 +892,7 @@ it will take the number of movements before it is 'its full size'.
 
 
 <div id="conclusions">
-# 7. <a href="#toc">Conclusion &#x28;and inspirational words for everyone&#x29;</a>
+# 7. <a href="#toc">Conclusion &lpar;and inspirational words for everyone&rpar;</a>
 </div>
 
 I believe that this file has given more than enough information for anyone to