Merge branch 'edge_job_documentation' into 'master'

Update rc documentation to include step about configuring Edge testing job

See merge request dev/release!2

doc/5.x-rc.md

@@ -82,6 +82,8 @@ civi-git-table --fetch master 5.X
 
 * Go to https://test.civicrm.org/job/CiviCRM-Core-Matrix/configure
     * In the list of `CIVIVER`s, remove any old RC's. Add the current RC. (ex: `4.6 5.X master`)
+* Go to https://test.civicrm.org/job/CiviCRM-Core-Edge/configure
+    * In the list of `CIVIVER`s, remove any old RC's. Add the current RC. (ex: `4.6 5.X master`)
 * Go to https://test.civicrm.org/job/CiviCRM-Ext-Matrix/configure
     * In the list of `CIVIVER`s, remove any old RC's. Add the current RC. (ex: `4.6 5.X master`)
 * Go to https://test.civicrm.org/job/CiviCRM-E2E-Matrix/configure