Bug 1358403 - Add a colon to complete the rust url when mach build dies when it can't find the rust compiler. r=froydnj

MozReview-Commit-ID: 3E3A9laTdoX

--HG--
extra : rebase_source : 2c5745eadd935b0e20abfb2d106bdb247ea0b5e8

build/moz.configure/rust.configure

@@ -50,7 +50,7 @@ def rust_compiler(rustc_info, cargo_info):
         die(dedent('''\
         Rust compiler not found.
         To compile rust language sources, you must have 'rustc' in your path.
-        See https//www.rust-lang.org/ for more information.
+        See https://www.rust-lang.org/ for more information.
 
         You can install rust by running './mach bootstrap'
         or by directly running the installer from https://rustup.rs/