Fix the Timer API parameter in the Documentation

[pedrominatel]

Board

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Device Description

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Hardware Configuration

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Version

latest master (checkout manually)

IDE Name

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Operating System

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Flash frequency

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PSRAM enabled

yes

Upload speed

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Description

This issue was reported by a user here: #6335 (comment)

Sketch

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Debug Message

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Other Steps to Reproduce

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I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.