internal: decide not to use `'db` in `NavigationTarget.docs`

crates/ide/src/navigation_target.rs

diff --git a/crates/ide/src/navigation_target.rs b/crates/ide/src/navigation_target.rs
index b8c14dc0..2403142 100644
--- a/crates/ide/src/navigation_target.rs
+++ b/crates/ide/src/navigation_target.rs
@@ -50,7 +50,6 @@
     pub kind: Option<SymbolKind>,
     pub container_name: Option<Symbol>,
     pub description: Option<String>,
-    // FIXME: Use the database lifetime here.
     pub docs: Option<Documentation<'static>>,
     /// In addition to a `name` field, a `NavigationTarget` may also be aliased
     /// In such cases we want a `NavigationTarget` to be accessible by its alias