Adding switch from Table::getInstance to explicit class invocation

[Hackwar]

User description

This is the documentation PR for joomla/joomla-cms#44090

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PR Type

Documentation

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Description

• Documented the switch from Table::getInstance to explicit class instantiation.

• Highlighted the removal of Table::addIncludePath functionality.

• Provided examples for old and new instantiation methods.

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Changes walkthrough 📝

	Relevant files
Documentation	removed-backward-incompatibility.md Documented changes in table instantiation approach              migrations/54-60/removed-backward-incompatibility.md Added documentation for switching from Table::getInstance to explicit class instantiation. Explained the removal of Table::addIncludePath functionality. Included code examples for old and new methods. +14/-0

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