Update documentation. (#2)

Author: chinmaygarde

README.md

@@ -30,7 +30,7 @@ Options
                   DOCSET_BUNDLE_ID property in your Doxyfile before generating
                   documentation.
 
-  --help          Print documentation documentation.
+  --help          Print this documentation.
 ```
 
 Preparing Doxygen for Docsets
@@ -39,6 +39,8 @@ Preparing Doxygen for Docsets
 * In the Doxyfile for your project, make sure the following options are set:
   * `GENERATE_DOCSET = YES`
   * `GENERATE_HTML   = YES`
+  * For more thorough instructions on configuring Doxygen. See this reference
+    https://kapeli.com/docsets#doxygen.
 * Invoke Doxygen to generate HTML documentation. On a successful invocation
   of doxygen with the required flags, the html/ directory should be generated.
   * This tool depends on reading the following files generated by Doxygen. If