[linters] Improve the linters-doc-url flag, by splitting the url from the left, so we allow urls with colons

Reviewed By: jvillard

Differential Revision: D5833131

fbshipit-source-id: 28b7698

infer/src/base/Config.ml

@@ -1886,7 +1886,7 @@ type linter_doc_url = {linter: string; doc_url: string}
 
 let process_linters_doc_url args =
   let linters_doc_url arg =
-    match String.rsplit2 ~on:':' arg with
+    match String.lsplit2 ~on:':' arg with
     | Some (linter, doc_url)
      -> {linter; doc_url}
     | None