[ASTERIXDB-2451][DOC] Fix object_unwrap() documentation

- user model changes: no
- storage format changes: no
- interface changes: no

Details:
- Fixed the documentation for object_unwrap function.

Change-Id: Id5822a51e49676dcd9aae35455d2e19fb6dfee07
Reviewed-on: https://asterix-gerrit.ics.uci.edu/3042
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <tillw@apache.org>
diff --git a/asterixdb/asterix-doc/src/main/markdown/builtins/8_record.md b/asterixdb/asterix-doc/src/main/markdown/builtins/8_record.md
index 187f04c..2bcdb3e 100644
--- a/asterixdb/asterix-doc/src/main/markdown/builtins/8_record.md
+++ b/asterixdb/asterix-doc/src/main/markdown/builtins/8_record.md
@@ -356,10 +356,10 @@
           "location": {"city": "Irvine", "state": "CA"}
         }
 
-### object_wrap ###
+### object_unwrap ###
  * Syntax:
 
-        object_wrap(input_object)
+        object_unwrap(input_object)
 
  * Returns the value of the single name-value pair that appears in `input_object`.
  * Arguments:
@@ -372,7 +372,7 @@
 
  * Example:
 
-        object_wrap(
+        object_unwrap(
                      {
                        "id": 1
                      }