Small improvements to types/pointer.md

IIUC, this paragraph is still only talking about raw pointers, so I made
that explicit like in the two paragraphs above.

Author: phansch

src/types/pointer.md

@@ -40,8 +40,8 @@ reference by reborrowing it (`&*` or `&mut *`). Raw pointers are generally
 discouraged in Rust code; they exist to support interoperability with foreign
 code, and writing performance-critical or low-level functions.
 
-When comparing pointers they are compared by their address, rather than by
-what they point to. When comparing pointers to [dynamically sized types] they
+When comparing raw pointers they are compared by their address, rather than by
+what they point to. When comparing raw pointers to [dynamically sized types] they
 also have their addition data compared.
 
 ## Smart Pointers