bpo-32746: Fix multiple typos (GH-5144)

Fix typos found by codespell in docs, docstrings, and comments.

Modules/md5module.c

@@ -293,7 +293,7 @@ md5_done(struct md5_state *md5, unsigned char *out)
         md5->curlen = 0;
     }
 
-    /* pad upto 56 bytes of zeroes */
+    /* pad up to 56 bytes of zeroes */
     while (md5->curlen < 56) {
         md5->buf[md5->curlen++] = (unsigned char)0;
     }