docs: proc.rst: fix indentation warning

Fix indentation snafu in proc.rst as reported by Stephen.

next-20210219/Documentation/filesystems/proc.rst:697: WARNING: Unexpected indentation.

Fixes: 93ea4a0b ("Documentation: proc.rst: add more about the 6 fields in loadavg")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20210223060418.21443-1-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/filesystems/proc.rst

@@ -694,7 +694,7 @@ files are there, and which are missing.
                 All fields are separated by one space except "number of
                 processes currently runnable" and "total number of processes
                 in system", which are separated by a slash ('/'). Example:
-                  0.61 0.61 0.55 3/828 22084
+                0.61 0.61 0.55 3/828 22084
  locks        Kernel locks
  meminfo      Memory info
  misc         Miscellaneous