[DOC] Minor mistakes in agentic-search and agents-tools documentations

[akolarkunnu]

What do you want to do?
Mistakes:

1. Link - https://docs.opensearch.org/latest/vector-search/ai-search/agentic-search/#step-1-enable-the-agentic-search-feature-flag
   Comma is not required in the sample command, it will throw exception with comma. Please remove the comma:
   PUT _cluster/settings
   {
   "persistent" : {
   "plugins.neural_search.agentic_search_enabled": true,
   }
   }

2. Link -https://docs.opensearch.org/latest/vector-search/ai-search/agentic-search/#step-4-create-a-search-pipeline
   Give link to QueryPlanningTool (https://docs.opensearch.org/latest/ml-commons-plugin/agents-tools/tools/query-planning-tool/) in the below text, so that reader can easily navigate to that link to learn more about QueryPlanningTool:
   "Create a search pipeline with an agentic query translator search request processor and pass the agent ID created with the QueryPlanningTool:"

3. Link - https://docs.opensearch.org/latest/ml-commons-plugin/agents-tools/agents-tools-tutorial/#step-2-create-an-ingest-pipeline
   Copy links are not provided in the sample commands in this section.

• Request a change to existing documentation

Tell us about your request. Provide a summary of the request.

Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.
3.0

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.

[natebower]

@akolarkunnu Would you be willing to create a PR addressing this issue? Thanks!

[akolarkunnu]

Yes, please assign to me.