Saw a FIXME comment and decided to fix it.

This renames `descend_into_macros` to  `descend_into_macros_single` and `descend_into_macros_many` into `descend_into_macros`.
 However, this does not touch a function in `SemanticsImpl` of same name.

crates/ide/src/hover.rs

@@ -116,7 +116,7 @@ pub(crate) fn hover(
         });
     }
 
-    let descended = sema.descend_into_macros_many(original_token.clone());
+    let descended = sema.descend_into_macros(original_token.clone());
 
     // FIXME: Definition should include known lints and the like instead of having this special case here
     if let Some(res) = descended.iter().find_map(|token| {