doc/cephfs: edit troubleshooting.rst

Edit the section "Kernel Mount Debugging" in the file
doc/cephfs/troubleshooting.rst.

Signed-off-by: Zac Dover <[email protected]>

Author: zdover23

doc/cephfs/troubleshooting.rst

@@ -287,10 +287,17 @@ If you suspect a potential monitor issue, enable monitor debugging as well
 Kernel mount debugging
 ======================
 
-If there is an issue with the kernel client, the most important thing is
-figuring out whether the problem is with the kernel client or the MDS. Generally,
-this is easy to work out. If the kernel client broke directly, there will be
-output in ``dmesg``. Collect it and any inappropriate kernel state.
+The first step in diagnosing and repairing an issue with the kernel client is
+determining whether the problem is in the kernel client or in the MDS. If the
+kernel client itself is broken, evidence of its breakage will be in the kernel
+ring buffer, which can be examined by running the following command:
+
+.. prompt:: bash #
+
+   dmesg
+
+Find the relevant kernel state.
+
 
 Slow requests
 -------------