minor #4418 use the C lexer for Varnish config examples (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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use the C lexer for Varnish config examples

Commits
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1d84139 use the C lexer for Varnish config examples

conf.py

@@ -22,8 +22,8 @@
 
 # adding PhpLexer
 from sphinx.highlighting import lexers
+from pygments.lexers.compiled import CLexer
 from pygments.lexers.web import PhpLexer
-from pygments.lexers.agile import RubyLexer
 
 # -- General configuration -----------------------------------------------------
 
@@ -101,9 +101,9 @@
 lexers['php-annotations'] = PhpLexer(startinline=True)
 lexers['php-standalone'] = PhpLexer(startinline=True)
 lexers['php-symfony'] = PhpLexer(startinline=True)
-lexers['varnish2'] = RubyLexer()
-lexers['varnish3'] = RubyLexer()
-lexers['varnish4'] = RubyLexer()
+lexers['varnish2'] = CLexer()
+lexers['varnish3'] = CLexer()
+lexers['varnish4'] = CLexer()
 
 config_block = {
     'varnish2': 'Varnish 2',