softirq: Fix typo in __do_softirq() comments

s/s/as

[ mingo: Also add a missing 'the', add proper punctuation and clarify what 'swap' means here. ]
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: alexander.levin@verizon.com
Cc: frederic@kernel.org
Cc: joel@joelfernandes.org
Cc: paulmck@linux.vnet.ibm.com
Cc: rostedt@goodmis.org
Link: http://lkml.kernel.org/r/20181018142133.12341-1-tiny.windzz@gmail.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

kernel/softirq.c

@@ -257,9 +257,9 @@ asmlinkage __visible void __softirq_entry __do_softirq(void)
 	int softirq_bit;
 
 	/*
-	 * Mask out PF_MEMALLOC s current task context is borrowed for the
-	 * softirq. A softirq handled such as network RX might set PF_MEMALLOC
-	 * again if the socket is related to swap
+	 * Mask out PF_MEMALLOC as the current task context is borrowed for the
+	 * softirq. A softirq handled, such as network RX, might set PF_MEMALLOC
+	 * again if the socket is related to swapping.
 	 */
 	current->flags &= ~PF_MEMALLOC;