Squiz/FunctionOpeningBraceSpace: update XML doc

- Update the sniff description and remove a code example for something
that the sniff doesn't check. The sniff only checks for blank lines
after the opening brace of a function, and not if the opening brace is
on its own line.
- Ensure the <documentation> title matches the sniff name.

Author: rodrigoprimo

src/Standards/Squiz/Docs/WhiteSpace/FunctionOpeningBraceSpaceStandard.xml

@@ -1,24 +1,9 @@
-<documentation title="Function Opening Brace Whitespace">
+<documentation title="Function Opening Brace Space">
     <standard>
     <![CDATA[
-    The opening brace for functions should be on a new line with no blank lines surrounding it.
+    There should be no blank lines after the opening brace of a function.
     ]]>
     </standard>
-    <code_comparison>
-        <code title="Valid: Opening brace is on a new line.">
-        <![CDATA[
-function foo()
-<em>{</em>
-}
-        ]]>
-        </code>
-        <code title="Invalid: Opening brace is on the same line as the function declaration.">
-        <![CDATA[
-function foo() <em>{</em>
-}
-        ]]>
-        </code>
-    </code_comparison>
     <code_comparison>
         <code title="Valid: No blank lines after the opening brace.">
         <![CDATA[