patch 8.2.2160: various typos

Problem:    Various typos.
Solution:   Fix spelling mistakes. (closes #7494)
diff --git a/src/insexpand.c b/src/insexpand.c
index 28017d4..8f4f976 100644
--- a/src/insexpand.c
+++ b/src/insexpand.c
@@ -3628,7 +3628,7 @@
 		    // line (probably) wrapped, set compl_startpos to the
 		    // first non_blank in the line, if it is not a wordchar
 		    // include it to get a better pattern, but then we don't
-		    // want the "\\<" prefix, check it bellow
+		    // want the "\\<" prefix, check it below
 		    compl_col = (colnr_T)getwhitecols(line);
 		    compl_startpos.col = compl_col;
 		    compl_startpos.lnum = curwin->w_cursor.lnum;