Fix small typo in Drop documentation

Author: mlodato517

library/core/src/ops/drop.rs

@@ -78,7 +78,7 @@
 ///
 /// In other words, if you tried to explicitly call `Drop::drop` in the above example, you'd get a compiler error.
 ///
-/// If you'd like explicitly call the destructor of a value, [`mem::drop`] can be used instead.
+/// If you'd like to explicitly call the destructor of a value, [`mem::drop`] can be used instead.
 ///
 /// [`mem::drop`]: drop
 ///