Fixed typos

- Removed duplicate words, like "the the" and "to to"
- Removed duplicate lines (one double sort line found in mysql.cc)
- Fixed some typos found while searching for duplicate words.

Command used to find duplicate words:
egrep -rI "\s([a-zA-Z]+)\s+\1\s" | grep -v param

Thanks to Artjoms Rimdjonoks for the command and pointing out the
spelling errors.

sql/sql_bitmap.h

@@ -175,7 +175,7 @@ public:
 
 private:
   /*
-     Intersect with a bitmap represented as as longlong.
+     Intersect with a bitmap represented as longlong.
      In addition, pad the rest of the bitmap with 0 or 1 bits
      depending on pad_with_ones parameter.
   */