Update references from AMP to AOP in documentation (#3972)

- Changed "AMP" to "AOP" in multiple locations across JSON and MDX files to reflect the correct terminology for the Agent Operations Platform.
- Updated the introduction sections in English, Korean, and Portuguese to ensure consistency in the platform's naming.

docs/docs.json

@@ -326,7 +326,7 @@
             ]
           },
           {
-            "tab": "AMP",
+            "tab": "AOP",
             "icon": "briefcase",
             "groups": [
               {
@@ -753,7 +753,7 @@
             ]
           },
           {
-            "tab": "AMP",
+            "tab": "AOP",
             "icon": "briefcase",
             "groups": [
               {