Docs: Update Pinecone Namespace note for free tier support (spring-ai-docs)

[2ghrms]

Description

The Spring AI documentation for the Pinecone Vector Store contains a potentially outdated note regarding namespace support on the Pinecone free tier.

The documentation states in two places that the Pinecone free tier does not support namespaces, which appears to be incorrect based on the current Pinecone free tier offering (which now includes support for one index with a namespace).

Problematic Section and Line

The note is present in the "Manual Configuration" section, specifically within the sample code comments:

• Line 195:

  .namespace(PINECONE_NAMESPACE) // the free tier doesn't support namespaces.

The note is also present in the "Prerequisites" section:

• Lines 30-34:

  [NOTE]
  ====
  This information is available to you in the Pinecone UI portal.
  The namespace support is not available in the Pinecone free tier.
  ====

Suggested Fix

The comment/note should be removed or updated to reflect that the Pinecone free tier does support namespaces (at least one namespace within the free index).

Suggested Action:

1. Remove the comment // the free tier doesn't support namespaces. from Line 195.
2. Remove or update the [NOTE] block in the "Prerequisites" section (Lines 30-34).

Reference: Please double-check the current Pinecone free tier plan to confirm the level of namespace support.