Bug 1473603 - Changed "Version History" sections in Data Documentation into secondary-level headings. r=janerik

Signed-off-by: Anushi Maheshwari <anushimaheshwari95@gmail.com>

--HG--
extra : rebase_source : 70593c8397ac2f020a5126082d5872527c756426

toolkit/components/telemetry/docs/data/crash-ping.rst

@@ -211,6 +211,6 @@ versions and builds of the same module. See `breakpad <https://chromium.googleso
 description for further information. This field is populated only on Windows.
 
 Version History
-===============
+---------------
 
 - Firefox 58: Added ipc_channel_error (`bug 1410143 <https://bugzilla.mozilla.org/show_bug.cgi?id=1410143>`_).

toolkit/components/telemetry/docs/data/environment.rst

@@ -432,7 +432,7 @@ For each experiment we collect the ``id`` and the ``branch`` the client is enrol
 
 
 Version History
-===============
+---------------
 
 - Firefox 61:
 

toolkit/components/telemetry/docs/data/event-ping.rst

@@ -87,6 +87,6 @@ events
 A map from process names to arrays of event records that have been :ref:`serialized <events.serializationformat>`.
 
 Version History
-===============
+---------------
 
 - Firefox 62: Started sending the "event" ping (`bug 1460595 <https://bugzilla.mozilla.org/show_bug.cgi?id=1460595>`_).

toolkit/components/telemetry/docs/data/main-ping.rst

@@ -678,7 +678,7 @@ Structure:
     ],
 
 Version History
-===============
+---------------
 
 - Firefox 61: