Address review comments.

Author: calumgrant

docs/codeql/codeql-language-guides/basic-query-for-ruby-code.rst

@@ -108,14 +108,12 @@ Browsing the results of our basic query shows that it could be improved. Among t
 
 .. code-block:: ruby
 
-   if ...
-     ...
-   elsif option == "-verbose"
+   if option == "-verbose"
      # nothing to do - handled earlier
    else
      error "unrecognized option"
 
-In this case, identifying the ``if`` statement with the empty ``then`` branch as redundant is a false positive. One solution to this is to modify the query to ignore empty ``then`` branches if the ``if`` statement has an ``else`` branch.
+In this case, identifying the ``if`` statement with the empty ``then`` branch as redundant is a false positive. One solution to this is to modify the query to select ``if`` statements where both the ``then`` and ``else`` branches are missing.
 
 To exclude ``if`` statements that have an ``else`` branch:
 

docs/codeql/codeql-language-guides/codeql-library-for-ruby.rst

@@ -73,7 +73,7 @@ The CodeQL examples in this article are only excerpts and are not meant to repre
 Abstract syntax
 ---------------
 
-The abstract syntax tree (AST) represents the elements of the source code organized into a tree. The AST viewer
+The abstract syntax tree (AST) represents the elements of the source code organized into a tree. The `AST viewer <https://codeql.github.com/docs/codeql-for-visual-studio-code/exploring-the-structure-of-your-source-code/>`__
 in Visual Studio Code shows the AST nodes, including the relevant CodeQL classes and predicates.
 
 All CodeQL AST classes inherit from the `AstNode` class, which provides the following member predicates