Auto merge of rust-lang#75817 - LeSeulArtichaut:proc_macro-docs, r=jyn514

Use intra-doc link in `proc_macro`

Yep. One link.

Helps with rust-lang#75080.
r? @jyn514

Author: bors

library/proc_macro/src/lib.rs

@@ -451,7 +451,7 @@ impl SourceFile {
     /// Also note that even if `is_real` returns `true`, if `--remap-path-prefix` was passed on
     /// the command line, the path as given may not actually be valid.
     ///
-    /// [`is_real`]: #method.is_real
+    /// [`is_real`]: Self::is_real
     #[unstable(feature = "proc_macro_span", issue = "54725")]
     pub fn path(&self) -> PathBuf {
         PathBuf::from(self.0.path())