Fix formatting of subsection names in the documentation
Fix formatting of subsection names in the documentation

'<formatter>' wasn't displayed at all, escaping '<' and '>' results in
the proper formatting.

Change-Id: Ibcf9b71203d8510e9649ee2dd09b5f91e8e6b4e6
Signed-off-by: Edwin Kempin <b444e279ad95fdef4fbdd82c813b624595df204a@sap.com>

GerritCodeReview/plugins_x-docs,GerritCodeReview/plugins_x-docs