Apply suggestions from code review

Co-authored-by: James Fletcher <42464962+jf205@users.noreply.github.com>

Author: felicitymay

docs/codeql/writing-codeql-queries/cross-the-river.rst

@@ -264,7 +264,7 @@ Here are some more example queries that solve the river crossing puzzle:
 
    .. container:: name
 
-      * Show/hide example query - modified path
+      *Show/hide example query - modified path*
 
    .. literalinclude:: river-answer-1-path.ql
       :language: ql
@@ -274,7 +274,7 @@ Here are some more example queries that solve the river crossing puzzle:
 
    .. container:: name
 
-      * Show/hide example query - abstract class
+      *Show/hide example query - abstract class*
 
    .. literalinclude:: river-answer-2-abstract-class.ql
       :language: ql
@@ -284,7 +284,7 @@ Here are some more example queries that solve the river crossing puzzle:
 
    .. container:: name
 
-      * Show/hide example query - datatypes
+      *Show/hide example query - datatypes*
 
    .. literalinclude:: river-answer-3-datatypes.ql
       :language: ql