Fixed misspellings

Fixed misspellings reported at [Bug #16437], missed and a new
typo.

debug_counter.h

@@ -31,7 +31,7 @@
  * * mc_miss_by_refine:          ... by ment being refined.
  * * mc_miss_by_visi:            ... by visibility change.
  * * mc_miss_spurious: spurious inline mc misshit.
- * * mc_miss_reuse_call: count of resue of cc->call.
+ * * mc_miss_reuse_call: count of reuse of cc->call.
  */
 RB_DEBUG_COUNTER(mc_inline_hit)
 RB_DEBUG_COUNTER(mc_inline_miss)

enc/trans/JIS/JISX0212%UCS.src

@@ -67,7 +67,7 @@ BEGIN_MAP
 #
 #	   However, JIS X 0212 maintains the distinction between
 #	   the lowercase forms of these two elements at 0x2942 and 0x2943.
-#	   Given the structre of these JIS encodings, it is clear that
+#	   Given the structure of these JIS encodings, it is clear that
 #	   0x2922 and 0x2942 are intended to be a capital/small pair.
 #	   Consequently, in the Unicode mapping, 0x2922 is treated as
 #	   LATIN CAPITAL LETTER D WITH STROKE.

enc/trans/JIS/UCS%JISX0212.src

@@ -67,7 +67,7 @@ BEGIN_MAP
 #
 #	   However, JIS X 0212 maintains the distinction between
 #	   the lowercase forms of these two elements at 0x2942 and 0x2943.
-#	   Given the structre of these JIS encodings, it is clear that
+#	   Given the structure of these JIS encodings, it is clear that
 #	   0x2922 and 0x2942 are intended to be a capital/small pair.
 #	   Consequently, in the Unicode mapping, 0x2922 is treated as
 #	   LATIN CAPITAL LETTER D WITH STROKE.

error.c

@@ -174,7 +174,7 @@ rb_warning_category_enabled_p(rb_warning_category_t category)
  * Supported categories are:
  *
  * +:deprecated+ :: deprecation warnings
- * * assignemnt of non-nil value to <code>$,</code> and <code>$;</code>
+ * * assignment of non-nil value to <code>$,</code> and <code>$;</code>
  * * keyword arguments
  * * proc/lambda without block
  * etc.