arch/tile: fix some comments and whitespace

This is a grab bag of changes with no actual change to generated code.
This includes whitespace and comment typos, plus a couple of stale
comments being removed.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/arch/tile/lib/atomic_32.c b/arch/tile/lib/atomic_32.c
index 20c3162..f02040d 100644
--- a/arch/tile/lib/atomic_32.c
+++ b/arch/tile/lib/atomic_32.c
@@ -52,7 +52,7 @@
 
 static inline int *__atomic_hashed_lock(volatile void *v)
 {
-	/* NOTE: this code must match "sys_cmpxchg" in kernel/intvec.S */
+	/* NOTE: this code must match "sys_cmpxchg" in kernel/intvec_32.S */
 #if ATOMIC_LOCKS_FOUND_VIA_TABLE()
 	unsigned long i =
 		(unsigned long) v & ((PAGE_SIZE-1) & -sizeof(long long));