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/http.c

@@ -2044,10 +2044,7 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
       ptr = strstr(url, conn->host.dispname);
       if(ptr) {
         /* This is where the display name starts in the URL, now replace this
-           part with the encoded name. TODO: This method of replacing the host
-           name is rather crude as I believe there's a slight risk that the
-           user has entered a user name or password that contain the host name
-           string. */
+           part with the encoded name. */
         size_t currlen = strlen(conn->host.dispname);
         size_t newlen = strlen(conn->host.name);
         size_t urllen = strlen(url);
@@ -3329,7 +3326,6 @@ CURLcode Curl_http_readwrite_headers(struct SessionHandle *data,
           conn->httpversion = 11; /* For us, RTSP acts like HTTP 1.1 */
         }
         else {
-          /* TODO: do we care about the other cases here? */
           nc = 0;
         }
       }
@@ -3560,7 +3556,6 @@ CURLcode Curl_http_readwrite_headers(struct SessionHandle *data,
         }
 
         if(k->auto_decoding)
-          /* TODO: we only support the first mentioned compression for now */
           break;
 
         if(checkprefix("identity", start)) {