docs: Don't define duplicate label in qemu-block-drivers.rst.inc

Sphinx requires that labels within documents are unique across the
whole manual.  This is because the "create a hyperlink" directive
specifies only the name of the label, not a filename+label.  Some
Sphinx versions will warn about duplicate labels, but even if there
is no warning there is still an ambiguity and no guarantee that the
hyperlink will be created to the right target.

For QEMU this is awkward, because we have various .rst.inc fragments
which we include into multiple .rst files.  If you define a label in
the .rst.inc file then it will be a duplicate label.  We have mostly
worked around this by not putting labels into those .rst.inc files,
or by adding "insert a label" functionality into the hxtool extension
(see commit 1eeb432 "doc/sphinx/hxtool.py: add optional label
argument to SRST directive").

Unfortunately in commit 7f63144 ("docs/devel: add a codebase
section") we accidentally added a duplicate label, because not all
Sphinx versions warn about the mistake.

In this case the link was only from the developer docs codebase
summary, so as the simplest fix for the stable branch, we drop
the link entirely.

Cc: [email protected]
Fixes: 1eeb432 "doc/sphinx/hxtool.py: add optional label argument to SRST directive"
Reported-by: Dario Faggioli <[email protected]>
Signed-off-by: Peter Maydell <[email protected]>
Acked-by: Eric Blake <[email protected]>
Reviewed-by: Pierrick Bouvier <[email protected]>
Message-id: [email protected]
(cherry picked from commit 82707dd)
Signed-off-by: Michael Tokarev <[email protected]>

Author: pm215

docs/devel/codebase.rst

@@ -116,7 +116,7 @@ yet, so sometimes the source code is all you have.
 * `monitor <https://gitlab.com/qemu-project/qemu/-/tree/master/monitor>`_:
   `Monitor <QEMU monitor>` implementation (HMP & QMP).
 * `nbd <https://gitlab.com/qemu-project/qemu/-/tree/master/nbd>`_:
-  QEMU `NBD (Network Block Device) <nbd>` server.
+  QEMU NBD (Network Block Device) server.
 * `net <https://gitlab.com/qemu-project/qemu/-/tree/master/net>`_:
   Network (host) support.
 * `pc-bios <https://gitlab.com/qemu-project/qemu/-/tree/master/pc-bios>`_:

docs/system/qemu-block-drivers.rst.inc

@@ -500,8 +500,6 @@ What you should *never* do:
 - expect it to work when loadvm'ing
 - write to the FAT directory on the host system while accessing it with the guest system
 
-.. _nbd:
-
 NBD access
 ~~~~~~~~~~