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>

diff --git a/doc/dev/developer_guide/essentials.rst b/doc/dev/developer_guide/essentials.rst
index c265e655ad6bea8850f24dc1ab48e1e8a1219f80..2d3591cdfabfa78561863b20d03e38a0f7e5bff5 100644 (file)
--- a/doc/dev/developer_guide/essentials.rst
+++ b/doc/dev/developer_guide/essentials.rst
@@ -187,7 +187,7 @@ 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.
 
@@ -289,7 +289,7 @@ 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