kernel.h: fix kernel-doc warning

Fix kernel-doc warning in kernel.h from commit 7ef88ad5
("BUILD_BUG_ON: make it handle more cases"):

  Warning(include/linux/kernel.h:605): No description found for parameter 'condition'
  Warning(include/linux/kernel.h:605): Excess function parameter 'cond' description in 'BUILD_BUG_ON'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/kernel.h

@@ -588,7 +588,7 @@ struct sysinfo {
 
 /**
  * BUILD_BUG_ON - break compile if a condition is true.
- * @cond: the condition which the compiler should know is false.
+ * @condition: the condition which the compiler should know is false.
  *
  * If you have some code which relies on certain constants being equal, or
  * other compile-time-evaluated condition, you should use BUILD_BUG_ON to