doc/dev: s/master/main/ essentials.rst dev guide

This PR changes all reference to the "master" branch
to references to the "main" branch (because we renamed
"master" to main", and the docs now need to reflect that).

Signed-off-by: Zac Dover <zac.dover@gmail.com>
(cherry picked from commit 728b8f26746c733988302d52cce4c46ebc607f63)

diff --git a/doc/dev/developer_guide/essentials.rst b/doc/dev/developer_guide/essentials.rst
index 092daeaca795f4beda3d1ecfb81bf684c495deea..96413628e3ecfc220c34d3924f9c2503f06306ff 100644 (file)
--- a/doc/dev/developer_guide/essentials.rst
+++ b/doc/dev/developer_guide/essentials.rst
@@ -152,7 +152,7 @@ file `CONTRIBUTING.rst`_ in the top-level directory of the source-code
 tree. There may be some overlap between this guide and that file.
 
 .. _`CONTRIBUTING.rst`:
-  https://github.com/ceph/ceph/blob/master/CONTRIBUTING.rst
+  https://github.com/ceph/ceph/blob/main/CONTRIBUTING.rst
 
 All newcomers are encouraged to read that file carefully.
 
@@ -252,7 +252,7 @@ See :ref:`kubernetes-dev`
 Backporting
 -----------
 
-All bugfixes should be merged to the ``master`` branch before being
+All bugfixes should be merged to the ``main`` branch before being
 backported. To flag a bugfix for backporting, make sure it has a
 `tracker issue`_ associated with it and set the ``Backport`` field to a
 comma-separated list of previous releases (e.g. "hammer,jewel") that you think