fix(parser) Resolve issue with missing TS property (#3225)

Using `highlightElement` with version 10.7.2 causes the following
TypeScript build error: "error TS2339: Property 'highlightElement' does
not exist on type 'HLJSApi'."

Author: jswanner

CHANGES.md

@@ -1,3 +1,9 @@
+## Version 10.7.3 (pending)
+
+- fix(parser) Resolves issue with missing TypeScript property [Jacob Swanner][]
+
+[Jacob Swanner]: https://github.com/jswanner
+
 ## Version 10.7.2
 
 This is a patch release.  The only change is that deprecation messages

types/index.d.ts

@@ -19,6 +19,7 @@ interface PublicApi {
     highlightAuto: (code: string, languageSubset?: string[]) => AutoHighlightResult
     fixMarkup: (html: string) => string
     highlightBlock: (element: HTMLElement) => void
+    highlightElement: (element: HTMLElement) => void
     configure: (options: Partial<HLJSOptions>) => void
     initHighlighting: () => void
     initHighlightingOnLoad: () => void