Auto merge of rust-lang#427 - nbaksalyar:fix-docs, r=BurntSushi

Fix docs referring to a wrong variable

The [variable name was changed](rust-lang@ebd26e9#diff-e76c21ee73748c8e0f6c9a32c9467a30L965) but the documentation wasn't, making it confusing.

Author: bors

src/re_bytes.rs

@@ -828,8 +828,8 @@ impl<'t> Captures<'t> {
         }
     }
 
-    /// Expands all instances of `$name` in `text` to the corresponding capture
-    /// group `name`, and writes them to the `dst` buffer given.
+    /// Expands all instances of `$name` in `replacement` to the corresponding
+    /// capture group `name`, and writes them to the `dst` buffer given.
     ///
     /// `name` may be an integer corresponding to the index of the
     /// capture group (counted by order of opening parenthesis where `0` is the

src/re_unicode.rs

@@ -979,8 +979,8 @@ impl<'t> Captures<'t> {
         }
     }
 
-    /// Expands all instances of `$name` in `text` to the corresponding capture
-    /// group `name`, and writes them to the `dst` buffer given.
+    /// Expands all instances of `$name` in `replacement` to the corresponding
+    /// capture group `name`, and writes them to the `dst` buffer given.
     ///
     /// `name` may be an integer corresponding to the index of the
     /// capture group (counted by order of opening parenthesis where `0` is the