stop using the word 'just'

Everywhere. In documentation and code comments.

It is almost never a good word and almost always a filler that should be
avoided.

Closes #20793

docs/examples/headerapi.c

@@ -52,7 +52,7 @@ int main(void)
     /* example.com is redirected, so we tell libcurl to follow redirection */
     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
 
-    /* this example just ignores the content */
+    /* this example ignores the content */
     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb);
 
     /* Perform the request, result gets the return code */