doc(core::panic::Location::caller): remove redundant space

Signed-off-by: Voxell Paladynee <paladyneshadow@gmail.com>

Author: Paladynee

library/core/src/panic/location.rs

@@ -143,7 +143,7 @@ impl<'a> Location<'a> {
     ///     let constant = constant_location();
     ///     assert_eq!(constant.file(), file!());
     ///     assert_eq!((constant.line(), constant.column()), (30, 5));
-    /// 
+    ///
     ///     let constant_2 = constant_location();
     ///     assert_eq!(
     ///         (constant.file(), constant.line(), constant.column()),