Links new TermsEnum api into docs. Remove superfluous “API” from page title. (#72992)

Closes #72982

docs/reference/search.asciidoc

@@ -18,6 +18,7 @@ exception of the <<search-explain,explain API>>.
 * <<scroll-api>>
 * <<clear-scroll-api>>
 * <<search-suggesters>>
+* <<search-terms-enum>>
 
 [discrete]
 [[search-testing-apis]]
@@ -79,6 +80,8 @@ include::search/count.asciidoc[]
 
 include::search/validate.asciidoc[]
 
+include::search/terms-enum.asciidoc[]
+
 include::search/explain.asciidoc[]
 
 include::search/profile.asciidoc[]

docs/reference/search/terms-enum.asciidoc

@@ -1,5 +1,5 @@
 [[search-terms-enum]]
-=== Terms enum API
+=== Terms enum
 
 The terms enum API can be used to discover terms in the index that match
 a partial string. This is used for auto-complete: