Docs: Fix MudDateRangePicker editable example

[birdalicious]

Docs - Date range picker editable example fixed

Description

Editable parameter does not exist changed to ReadOnly

How Has This Been Tested?

visually

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests. N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.11%. Comparing base (28bc599) to head (9eca8a6).
Report is 115 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8806      +/-   ##
==========================================
+ Coverage   89.82%   90.11%   +0.28%     
==========================================
  Files         412      420       +8     
  Lines       11878    12213     +335     
  Branches     2364     2409      +45     
==========================================
+ Hits        10670    11006     +336     
+ Misses        681      664      -17     
- Partials      527      543      +16     

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[ScarletKuro]

Hi, Thanks for PR.

@henon is this something that should be added to #8771 or it's just something old / added by mistake.
Also, shouldn't we renamed the Editable for MudPicker to ReadOnly? Feels wrong that we have different property names for same thing.

[henon]

Yes, ReadOnly is the new standard now. We have to roll it out where it is not yet used.