Issue #17449: Add XDocs examples for MethodCountCheck max* properties

[Vishalup29]

Issue: #17449

This PR adds XDocs examples for the following MethodCountCheck properties:

• maxPrivate
• maxPackage
• maxProtected

Changes included:

• Added a new example configuration and code snippet (Example4) in methodcount.xml to demonstrate using separate maximums for private, package-private, and protected methods.
• Added a corresponding XDocs example source file Example4.java under src/xdocs-examples/resources/com/puppycrawl/tools/checkstyle/checks/sizes/methodcount.
• Updated methodcount.xml.template to wire in the new example using the standard <macro name="example"> pattern.
• Removed MethodCountCheck (maxPrivate, maxPackage, maxProtected) from the SUPPRESSED_PROPERTIES_BY_CHECK map in XdocsExampleFileTest, as these properties are now covered by XDocs examples.

Testing:

• mvn -Pno-validations -DskipITs -DskipUTs=false test
• Verified that XdocsExampleFileTest now passes without suppressions for MethodCountCheck.

[romani]

Please read and watch videos at Starting_Development. Please make CI green.

[Vishalup29]

@romani CI green

[romani]

GitHub, generate website

[github-actions[bot]]

https://checkstyle-diff-reports.s3.us-east-2.amazonaws.com/6805c08_20251214171357/index.html

https://checkstyle-diff-reports.s3.us-east-2.amazonaws.com/6805c08_20251214171357/checks/sizes/methodcount.html#Examples

[romani]

Please read and watch videos at Starting_Development. Please make CI green.

[romani]

https://checkstyle.org/checks/sizes/methodcount.html#MethodCount

You might noticed that all examples are same by java code and changing only by comments. Please continue this approach. You can have 3 examples for each property to be used individually to show it's behavior idenpendetly

[Vishalup29]

@romani DOne CI green