cleanup: general removal of TODO (and similar) comments

They tend to never get updated anyway so they're frequently inaccurate
and we never go back to revisit them anyway. We document issues to work
on properly in KNOWN_BUGS and TODO instead.

lib/openldap.c

@@ -176,9 +176,7 @@ static CURLcode ldap_setup_connection(struct connectdata *conn)
   li->proto = proto;
   conn->proto.generic = li;
   connkeep(conn, "OpenLDAP default");
-  /* TODO:
-   * - provide option to choose SASL Binds instead of Simple
-   */
+
   return CURLE_OK;
 }
 
@@ -481,8 +479,6 @@ static ssize_t ldap_recv(struct connectdata *conn, int sockindex, char *buf,
     lr->nument++;
     rc = ldap_get_dn_ber(li->ld, ent, &ber, &bv);
     if(rc < 0) {
-      /* TODO: verify that this is really how this return code should be
-         handled */
       *err = CURLE_RECV_ERROR;
       return -1;
     }