doc: add version information for new configurations

Providing the version-added for a series of recently added configuration
options added to the implementation.

Signed-off-by: James Knight <[email protected]>

Author: jdknight

doc/configuration.rst

@@ -1325,6 +1325,8 @@ Advanced publishing configuration
 
 .. confval:: confluence_version_comment
 
+    .. versionadded:: 1.8
+
     A string value to be added as a comment to Confluence's version history.
 
     .. code-block:: python
@@ -1445,6 +1447,8 @@ Advanced processing configuration
 
 .. confval:: confluence_latex_macro
 
+    .. versionadded:: 1.8
+
     .. note::
 
         Confluence does not provide stock support for LaTeX macros.