Update doc for MethodLength

[nrmancuso]

https://checkstyle.org/config_sizes.html#MethodLength

Add example for each existing config to show what code is ok and what code cause violation.

A good example is https://checkstyle.org/config_naming.html#AbstractClassName.

Look at referenced commits of #5832, to see what and how should be changed in code.

Please play with module/check by means of https://checkstyle.org/cmdline.html to understand how it works.

PLEASE READ https://github.com/checkstyle/checkstyle/wiki/Good-practice-on-how-to-update-examples

[nrmancuso]

We should show in new examples the effect that both block and single line comments have on this check depending on countEmpty property.

[adekzs]

Can I work on this

[nrmancuso]

Sure, please leave a comment "I am on it", and send PR. Pay special attention to comment at #11474 (comment) pertaining to changes made at #11312

[adekzs]

I am on it

[Shaman20]

Can I work on this issue?

[romani]

No, there is already PR for this issue Issue #11523

[strkkk]

fix is merged