cleanup: Fix documentation build error for ACQUIRE updates

Stephen reports:

Documentation/core-api/cleanup:7: include/linux/cleanup.h:73: ERROR: Unexpected indentation. [docutils]
Documentation/core-api/cleanup:7: include/linux/cleanup.h:74: WARNING: Block quote ends without a blank line; unexpected unindent. [docutils]

Which points out that the ACQUIRE() example in cleanup.h missed the "::"
suffix to mark the following text as a code-block.

Fixes: 857d18f ("cleanup: Introduce ACQUIRE() and ACQUIRE_ERR() for conditional locks")
Reported-by: Stephen Rothwell <[email protected]>
Closes: http://lore.kernel.org/[email protected]
Signed-off-by: Dan Williams <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Tested-by: Randy Dunlap <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Dave Jiang <[email protected]>

Author: djbw

include/linux/cleanup.h

@@ -64,8 +64,7 @@
  * the remainder of "func()".
  *
  * The ACQUIRE() macro can be used in all places that guard() can be
- * used and additionally support conditional locks
- *
+ * used and additionally support conditional locks::
  *
  *	DEFINE_GUARD_COND(pci_dev, _try, pci_dev_trylock(_T))
  *	...