refactor: avoid tabs in markdown files

[vbreuss]

This PR updates the .editorconfig file to enforce space-based indentation for Markdown files and makes corresponding formatting adjustments to existing Markdown documentation files to comply with the new configuration.

Key Changes:

• Added Markdown-specific formatting rules to .editorconfig requiring 2-space indentation instead of tabs
• Updated markdown files to remove tabs and add blank lines for improved formatting

[Copilot]

Pull request overview

This PR updates the .editorconfig file to enforce space-based indentation for Markdown files and makes corresponding formatting adjustments to existing Markdown documentation files to comply with the new configuration.

Changes:

• Added Markdown-specific formatting rules to .editorconfig requiring 2-space indentation instead of tabs
• Updated markdown files to remove tabs and add blank lines for improved formatting

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
.editorconfig	Added Markdown section with space indentation rules (indent_size: 2, indent_style: space)
Docs/pages/setup/04-parameter-matching.md	Added blank line after "Regular Expressions" heading
Docs/pages/setup/03-indexers.md	Added blank line before "Notes:" section
CONTRIBUTING.md	Reformatted wrapped text to remove inline continuation

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Test Results

    21 files  ±0      21 suites  ±0   6m 17s ⏱️ + 1m 15s
 2 518 tests ±0   2 517 ✅ ±0  1 💤 ±0  0 ❌ ±0 
16 807 runs  ±0  16 806 ✅ ±0  1 💤 ±0  0 ❌ ±0 

Results for commit 9a0b7aa. ± Comparison against base commit 2852edd.

[github-actions]

🚀 Benchmark Results

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.3 LTS (Noble Numbat)

AMD EPYC 7763 3.17GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.102

[Host] : .NET 10.0.2 (10.0.2, 10.0.225.61305), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Simple_Mockolate	1.605 μs	0.0145 μs	0.0136 μs	0.2270	-	3.73 KB
Simple_Moq	177.561 μs	1.1490 μs	1.0186 μs	0.4883	-	14.55 KB
Simple_NSubstitute	5.819 μs	0.0344 μs	0.0305 μs	0.5569	0.0076	9.14 KB
Simple_FakeItEasy	6.409 μs	0.0531 μs	0.0496 μs	0.4959	-	8.11 KB

[github-actions]

This is addressed in release v1.2.0.