Minor doc updates; updating python 2 references to python 3 and updating grammar

python/ql/src/Functions/ConsistentReturns.qhelp

@@ -6,7 +6,7 @@
 
 <overview>
 <p>When a function contains both explicit returns (<code>return value</code>) and implicit returns
-(where code falls off the end of a function) this often indicates that a return
+(where code falls off the end of a function), this often indicates that a return
 statement has been forgotten. It is best to return an explicit return value even when returning
 <code>None</code> because this makes it easier for other developers to read your code.
 </p>
@@ -29,7 +29,7 @@ return value of <code>None</code> as this equates to <code>False</code>. However
 </example>
 <references>
 
-<li>Python Language Reference: <a href="http://docs.python.org/2/reference/compound_stmts.html#function">Function definitions</a>.
+<li>Python Language Reference: <a href="http://docs.python.org/3/reference/compound_stmts.html#function">Function definitions</a>.
 </li>
 
 

python/ql/src/Functions/ConsistentReturns.ql

@@ -1,6 +1,6 @@
 /**
  * @name Explicit returns mixed with implicit (fall through) returns
- * @description Mixing implicit and explicit returns indicates a likely error as implicit returns always return 'None'.
+ * @description Mixing implicit and explicit returns indicates a likely error as implicit returns always return `None`.
  * @kind problem
  * @tags quality
  *       reliability
@@ -31,4 +31,4 @@ predicate has_implicit_return(Function func) {
 from Function func
 where explicitly_returns_non_none(func) and has_implicit_return(func)
 select func,
-  "Mixing implicit and explicit returns may indicate an error as implicit returns always return None."
+  "Mixing implicit and explicit returns may indicate an error, as implicit returns always return None."

python/ql/src/Functions/InitIsGenerator.qhelp

@@ -22,7 +22,7 @@ not logical in the context of an initializer.</p>
 </example>
 <references>
 
-  <li>Python: <a href="http://docs.python.org/2.7/reference/datamodel.html#object.__init__">The __init__ method</a>.</li>
+  <li>Python: <a href="http://docs.python.org/3/reference/datamodel.html#object.__init__">The __init__ method</a>.</li>
 
 </references>
 </qhelp>

python/ql/src/Functions/ModificationOfParameterWithDefault.qhelp

@@ -37,7 +37,7 @@ function with a default of <code>default=None</code>, check if the parameter is
 <references>
 
   <li>Effbot: <a href="https://web.archive.org/web/20201112004749/http://effbot.org/zone/default-values.htm">Default Parameter Values in Python</a>.</li>
-  <li>Python Language Reference: <a href="http://docs.python.org/2/reference/compound_stmts.html#function-definitions">Function definitions</a>.</li>
+  <li>Python Language Reference: <a href="http://docs.python.org/3/reference/compound_stmts.html#function-definitions">Function definitions</a>.</li>
 
 
 </references>