Fixes in html files of 1993

1993/leo/README.md

@@ -38,7 +38,7 @@ International Internet community.
 
 This program plays
 [Mastermind](https://en.wikipedia.org/wiki/Mastermind_(board_game)), if you call
-it by a name ending by 'd', otherwise it _solves_ Mastermind. Call it without
+it by a name ending by `d`, otherwise it _solves_ Mastermind. Call it without
 parameters to use 6 digits (colors), or indicate the number of possible digits
 (you cannot change the number of positions so easily).
 
@@ -66,7 +66,7 @@ backspaces. Do "disable scrolling" on cmdtool or similar emulators.
 
 #### Bugs
 
-Please don't type ^D at the prompt!!
+Please don't type `^D` at the prompt!!
 
 
 ##### EXAMPLE: Suppose we think of 1234

1993/leo/index.html

@@ -419,7 +419,7 @@ International Internet community.</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <p>This program plays
 <a href="https://en.wikipedia.org/wiki/Mastermind_(board_game)">Mastermind</a>, if you call
-it by a name ending by ‘d’, otherwise it <em>solves</em> Mastermind. Call it without
+it by a name ending by <code>d</code>, otherwise it <em>solves</em> Mastermind. Call it without
 parameters to use 6 digits (colors), or indicate the number of possible digits
 (you cannot change the number of positions so easily).</p>
 <p>The number in parentheses is the number of possible combinations,
@@ -439,7 +439,7 @@ of binary coded colors-base numbers is.</p>
 <p>Suggestions: Use terminal (or emulator) with non-destructive
 backspaces. Do “disable scrolling” on cmdtool or similar emulators.</p>
 <h4 id="bugs">Bugs</h4>
-<p>Please don’t type ^D at the prompt!!</p>
+<p>Please don’t type <code>^D</code> at the prompt!!</p>
 <h5 id="example-suppose-we-think-of-1234">EXAMPLE: Suppose we think of 1234</h5>
 <pre><code>    $ ./leo
     (1296): 6433