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.

2005/toledo/README.md

@@ -68,14 +68,14 @@ get the first mode, run the program without arguments:
 ```
 
 The other mode is accessible running the program with one argument
-(5-[ply](https://en.wikipedia.org/wiki/Ply_(game_theory))
+(5-[ply](https://en.wikipedia.org/wiki/Ply_(game_theory))
 analysis):
 
 ``` <!---sh-->
     ./toledo a
 ```
 
-Two arguments for 6-[ply](https://en.wikipedia.org/wiki/Ply_&#x28;game_theory&#x29;)
+Two arguments for 6-[ply](https://en.wikipedia.org/wiki/Ply_&lpar;game_theory&rpar;)
 analysis:
 
 ``` <!---sh-->
@@ -83,7 +83,7 @@ analysis:
 ```
 
 And each successive argument will analyze one
-[ply](https://en.wikipedia.org/wiki/Ply_&#x28;game_theory&#x29;) more. There is no ply
+[ply](https://en.wikipedia.org/wiki/Ply_&lpar;game_theory&rpar;) more. There is no ply
 limit, but beyond 7 ply is very slow, try it at your own risk and computing
 time.
 
@@ -125,7 +125,7 @@ algorithms.
 
 The interface accounts for only a fraction of the code, the core does multiples
 functions: it is called recursively to analyze and evaluate each
-[ply](https://en.wikipedia.org/wiki/Ply_&#x28;game_theory&#x29;), does [alpha-beta
+[ply](https://en.wikipedia.org/wiki/Ply_&lpar;game_theory&rpar;), does [alpha-beta
 pruning](https://en.wikipedia.org/wiki/Alpha-beta_pruning), move generation,
 machine playing, check detection, illegal move verification and does moves after
 they are verified.
@@ -142,7 +142,7 @@ Other features are:
 * [Checkmate](https://en.wikipedia.org/wiki/Checkmate) detection.
 * Stalemate detection.
 * Computer is tough (check
-7-[ply](https://en.wikipedia.org/wiki/Ply_&#x28;game_theory&#x29;) and even in 5 ply can give a surprise to
+7-[ply](https://en.wikipedia.org/wiki/Ply_&lpar;game_theory&rpar;) and even in 5 ply can give a surprise to
 amateur players.