docs: fix broken Table of Contents anchors for duplicate headings

[youngfish42]

Summary

This PR fixes the broken in-document navigation links in the Table of
Contents of MATLAB-Coding-Guidelines.md, addressing #5.

Problem

GitHub-Flavored Markdown auto-generates heading anchors by slugifying
the heading text (lowercasing, replacing spaces with -, stripping
punctuation). When the same heading text appears multiple times in a
document, GitHub disambiguates the later occurrences by appending
-1, -2, -3, ... to their slugs, in order of appearance.

The current TOC uses the bare slug (e.g. #general, #variables)
for every duplicate, so all six "General" links jump to the same
first section (under "Naming Guidelines"), and both "Variables"
links jump to the first "Variables" section. Users cannot navigate
to the intended subsections via the TOC.

The document contains the following duplicated headings:

• ## General appears 6 times (Naming, Statements & Expressions,
  Code Comments, Function Authoring, Class Authoring, Error Handling)
• ## Variables appears 2 times (Naming, Statements & Expressions)

Fix

Append the correct GitHub-generated suffix (-1 .. -5) to the
anchor of every duplicate TOC entry. The visible link text is left
unchanged; only the anchor target is corrected.

TOC entry	Old anchor	New anchor
Statements and Expressions > General	#general	#general-1
Statements and Expressions > Variables	#variables	#variables-1
Code Comments > General	#general	#general-2
Function Authoring > General	#general	#general-3
Class Authoring > General	#general	#general-4
Error Handling > General	#general	#general-5

All other TOC entries already point to unique headings and are left
untouched.

Scope

• Files touched: MATLAB-Coding-Guidelines.md (TOC block only,
  lines 18, 19, 30, 33, 37, 41)
• No content, heading text, or section ordering is changed.
• No new files are added.

Verification

Rendered the file on GitHub after the change and confirmed that each
TOC link now jumps to its intended section.

Closes #5

[Copilot]

Pull request overview

This PR fixes broken in-document navigation in MATLAB-Coding-Guidelines.md by updating Table of Contents links for duplicated headings so each TOC entry points to the correct GitHub-generated anchor (e.g., #general-1, #general-2, …).

Changes:

• Update the “General” TOC entries to use the correct disambiguated anchors (#general-1 through #general-5).
• Update the second “Variables” TOC entry to use the correct disambiguated anchor (#variables-1).

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