Bug 1567592: Ensure launcher-process-failure ping makes it into docs ToC, also fix a typo; r=chutten

Differential Revision: https://phabricator.services.mozilla.com/D38720

--HG--
rename : toolkit/components/telemetry/docs/data/launcher-process-failure.rst => toolkit/components/telemetry/docs/data/launcher-process-failure-ping.rst
extra : moz-landing-system : lando

toolkit/components/telemetry/docs/data/launcher-process-failure-ping.rst

@@ -16,7 +16,7 @@ Structure:
       "update_channel": <string>,
       "build_id": <string>,
       "build_version": <string>,
-      // Windows version numnber in major.minor.build.UBR format (UBR is optional, only available on Win10)
+      // Windows version number in major.minor.build.UBR format (UBR is optional, only available on Win10)
       "os_version": <string>,
       // True if this build was running atop a Windows Server OS
       "server_os": <bool>,