Auto merge of #28155 - vchimishuk:doc-rust-inside-other-languages-tab, r=alexcrichton

Fixed x variable identation. How it was displayed in Firefox before: http://s16.postimg.org/c9448tn0k/Screenshot_from_2015_09_01_17_35_43.jpg

Author: bors

src/doc/trpl/rust-inside-other-languages.md

@@ -111,7 +111,7 @@ fn process() {
             for _ in (0..5_000_000) {
                 x += 1
             }
-	    x
+            x
         })
     }).collect();