Update documentation links

Author: Kevin Paulisse

doc/optionsref.md

@@ -436,7 +436,7 @@ on which this is running. (<a href="../lib/octocatalog-diff/cli/options/facts_te
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       Specify one or more filters to apply to the results of the catalog difference.
 For a list of available filters and further explanation, please refer to
-[Filtering results](/doc/advanced-filter.md). (<a href="../lib/octocatalog-diff/catalog-diff/cli/options/filters.rb">filters.rb</a>)
+<a href="advanced-filter.md">Filtering results</a>. (<a href="../lib/octocatalog-diff/cli/options/filters.rb">filters.rb</a>)
     </td>
   </tr>
 

lib/octocatalog-diff/cli/options/filters.rb

@@ -2,7 +2,7 @@
 
 # Specify one or more filters to apply to the results of the catalog difference.
 # For a list of available filters and further explanation, please refer to
-# [Filtering results](/doc/advanced-filter.md).
+# <a href="advanced-filter.md">Filtering results</a>.
 # @param parser [OptionParser object] The OptionParser argument
 # @param options [Hash] Options hash being constructed; this is modified in this method.
 OctocatalogDiff::Cli::Options::Option.newoption(:filters) do