docs(agent-tracing): update gen_ai attribute names and rename instrumentLangGraph

[nicohrubec]

DESCRIBE YOUR PR

Apply the v11 gen_ai.* attribute renames (Mastra page + manual span-metrics example), rename instrumentLangGraph to instrumentStateGraph, and document the separate instrumentCreateReactAgent manual helper on the LangGraph pages (JavaScript and React Native).

⚠️ Do not merge until v11 is released as stable.

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[linear-code]

SDK-1480

[sentry]

Bug: The createReactAgent code snippet uses llm and tools without defining them. Users copying only this snippet will encounter a ReferenceError.
_{Severity: MEDIUM}

Suggested Fix

Update the createReactAgent code snippet to be self-contained. Either define the llm and tools variables directly within the same code block or add comments indicating that these variables must be defined and sourced from earlier in the user's application code.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location:
docs/platforms/javascript/common/configuration/integrations/langgraph.mdx#L136-L144

Potential issue: The documentation provides a code snippet for `createReactAgent` that
uses the variables `llm` and `tools`. However, these variables are not defined within
the snippet itself; they are defined in a separate, preceding code block. A user who
copies only the `createReactAgent` example will encounter a runtime `ReferenceError: llm
is not defined` because the necessary context is missing. This makes the documentation
incomplete and will cause the example code to fail for users following the guide.

Also affects:

• docs/platforms/react-native/common/integrations/langgraph.mdx:60~68