Update src/librustdoc/html/static/js/rustdoc.d.ts

Co-authored-by: lolbinarycat <[email protected]>

Author: notriddle

src/librustdoc/html/static/js/rustdoc.d.ts

@@ -249,6 +249,8 @@ declare namespace rustdoc {
 
     /**
      * A function signature in the search index database
+     *
+     * Note that some non-function items (eg. constants, struct fields) have a function signature so they can appear in type-based search.
      */
     interface FunctionData {
         functionSignature: FunctionSearchType|null,