Rollup merge of rust-lang#25210 - rick68:patch-1, r=alexcrichton

fixed a doc mistake in libcore/marker.mk

Author: Manishearth

src/libcore/marker.rs

@@ -313,7 +313,7 @@ macro_rules! impls{
 /// mismatches by enforcing types in the method implementations:
 ///
 /// ```
-/// # trait ResType { fn foo(&self); };
+/// # trait ResType { fn foo(&self); }
 /// # struct ParamType;
 /// # mod foreign_lib {
 /// # pub fn new(_: usize) -> *mut () { 42 as *mut () }