patch 8.2.3914: various spelling mistakes in comments

Problem:    Various spelling mistakes in comments.
Solution:   Fix the mistakes. (Dominique Pellé, closes #9416)
diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
index 4d7d553..0a07edb 100644
--- a/src/regexp_nfa.c
+++ b/src/regexp_nfa.c
@@ -2334,7 +2334,7 @@
 	    // will emit NFA_STAR.
 	    // Bail out if we can use the other engine, but only, when the
 	    // pattern does not need the NFA engine like (e.g. [[:upper:]]\{2,\}
-	    // does not work with with characters > 8 bit with the BT engine)
+	    // does not work with characters > 8 bit with the BT engine)
 	    if ((nfa_re_flags & RE_AUTO)
 				   && (maxval > 500 || maxval > minval + 200)
 				   && (maxval != MAX_LIMIT && minval < 200)
@@ -4972,7 +4972,7 @@
 
     // First add the state(s) at the end, so that we know how many there are.
     // Pass the listidx as offset (avoids adding another argument to
-    // addstate().
+    // addstate()).
     r = addstate(l, state, subs, pim, -listidx - ADDSTATE_HERE_OFFSET);
     if (r == NULL)
 	return NULL;