Summary of Changes

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This pull request refines the documentation to provide more accurate information regarding mruby's limitations on operator overriding and class subclassing. The changes clarify that operator overriding restrictions apply only to primitive classes due to VM optimizations, and that String classes, like Array, cannot support instance variables when subclassed to reduce memory. This prevents potential misunderstandings about mruby's capabilities.

Highlights

• Operator Overriding Clarification: The documentation has been updated to clarify that operator overriding restrictions apply specifically to primitive classes, not all classes, addressing potential misunderstandings.
• String Subclassing Limitations: The documentation now explicitly states that String classes, similar to Array, do not support instance variables when subclassed due to memory optimization.

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• doc/guides/language.md
  • Updated the heading "Array Subclasses" to "Array and String Subclasses".
  • Modified the explanation for subclassing limitations to include String alongside Array.
  • Revised the "Operator Overriding" section to specify that operators of primitive classes cannot be overridden and used String#+ as an example.
• doc/limitations.md
  • Reworded the "Operator modification" section to state that operators on some primitive classes cannot be overridden because they are optimized in the VM.

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