Fix duplicate tag in documentation. (#1681)

Closes #1673.

Author: mikereiche

src/main/asciidoc/template.adoc

@@ -88,7 +88,7 @@ couchbaseTemplate.mutateInById(User.class)
 ----
 ====
 
-[[template.sub-document-ops]]
+[[template.sub-document-ops-multi]]
 === Executing Multiple Sub-Document Operations
 
 Multiple Sub-Document operations can be executed at once on the same document, allowing you to modify several Sub-Documents at once. When multiple operations are submitted within the context of a single mutateIn command, the server will execute all the operations with the same version of the document.
@@ -129,4 +129,4 @@ couchbaseTemplate.mutateInById(User.class)
     .withCasProvided()
     .one(user);
 ----
-====
+====