Docs: fix ConditionalTask example comment and missing tool

[norhum]

• Fix incorrect comment (True executes ConditionalTask)
• Add missing SerperDevTool to data_processor_agent

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Note

Low Risk
Docs-only changes that adjust an example comment and agent tool configuration; no runtime product code is affected.

Overview
Updates the conditional-tasks.mdx example (EN/KO/PT-BR) to clarify that the condition returning True executes the ConditionalTask (rather than skipping it).

Adds the missing SerperDevTool configuration to data_processor_agent so the conditional task example has the required tool available, and fixes the code block ending/newline formatting.

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