fix typo

Author: lcnr

compiler/rustc_passes/src/diagnostic_items.rs

@@ -83,7 +83,7 @@ fn collect_item(tcx: TyCtxt<'_>, items: &mut DiagnosticItems, name: Symbol, item
     }
 }
 
-/// Extract the first `rustc_diagnostic_item = "$name"` out of a list of attributes.p
+/// Extract the first `rustc_diagnostic_item = "$name"` out of a list of attributes.
 fn extract(attrs: &[ast::Attribute]) -> Option<Symbol> {
     attrs.iter().find_map(|attr| {
         if attr.has_name(sym::rustc_diagnostic_item) { attr.value_str() } else { None }