bitbake: fetch2/git: Clarify the meaning of namespace

Namespace in this context means a branch, a tag, etc., clarify
it in the description. Also, fix a typo "a any", replace with
plain "any".

This patch is based of feedback on new applied patch
d32e5b0e ("fetch2/git: Prevent git fetcher from fetching gitlab repository metadata")

(Bitbake rev: a40fc6a3f774bcb28cf72701ac146ceb7ae8061a)

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit b4999425c812b25cb359d5163d11e3c1b030dc28)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.rst

@@ -424,8 +424,8 @@ This fetcher supports the following parameters:
 
 -  *"nobranch":* Tells the fetcher to not check the SHA validation for
    the branch when set to "1". The default is "0". Set this option for
-   the recipe that refers to the commit that is valid for a any namespace
-   instead of the branch.
+   the recipe that refers to the commit that is valid for any namespace
+   (branch, tag, ...) instead of the branch.
 
 -  *"bareclone":* Tells the fetcher to clone a bare clone into the
    destination directory without checking out a working tree. Only the

bitbake/lib/bb/fetch2/git.py

@@ -44,7 +44,8 @@ Supported SRC_URI options are:
 
 - nobranch
    Don't check the SHA validation for branch. set this option for the recipe
-   referring to commit which is valid in any namespace instead of branch.
+   referring to commit which is valid in any namespace (branch, tag, ...)
+   instead of branch.
    The default is "0", set nobranch=1 if needed.
 
 - usehead