Add pluralization for 'canvas'

[ianrandmckenzie]

Summary

This is a proposed fix for the pluralization of the word "canvas." Related issue: #34035

This is only my second time contributing to open source (and my first time contributing to an active project), so please let me know if I'm doing anything wrong.

Cheers,

Ian

[rails-bot]

Thanks for the pull request, and welcome! The Rails team is excited to review your changes, and you should hear from @kaspth (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

This repository is being automatically checked for code quality issues using Code Climate. You can see results for this analysis in the PR status below. Newly introduced issues should be fixed before a Pull Request is considered ready to review.

Please see the contribution instructions for more information.

[sharang-d]

I don't think these are to be updated according to:

rails/activesupport/lib/active_support/inflections.rb

Lines 5 to 10 in 7d15bbf

	#--
	# Defines the standard inflection rules. These are the starting point for
	# new projects and are not considered complete. The current set of inflection
	# rules is frozen. This means, we do not change them to become more complete.
	# This is a safety measure to keep existing applications from breaking.
	#++

[ianrandmckenzie]

@sharang-d Ah, I completely missed that. Oops. I suppose this can be disregarded, then.

[kaspth]

Yeah, the inflections are frozen. Thanks!