DOCSP-29036: C guides reformatting (#3)

* DOCSP-29036: C guides reformatting

* rest of guides

* edits

Author: norareidy

source/docs-libmongoc/authentication.txt

@@ -1,4 +1,4 @@
-.. _mongoc_authentication
+.. _mongoc_authentication:
 
 Authentication
 ==============
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    :backlinks: none
    :depth: 2
    :class: singlecol
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+
 This guide covers the use of authentication options with the MongoDB C Driver. Ensure that the MongoDB server is also properly configured for authentication before making a connection. For more information, see the `MongoDB security documentation <https://www.mongodb.com/docs/manual/administration/security/>`_.
 
 The MongoDB C driver supports several authentication mechanisms through the use of MongoDB connection URIs.