ordinal(1)->1st: ordinal added to misc

[smichr]

References to other Issues or PRs

Brief description of what is fixed or changed

This utility function corrects and extends an inline version that is present in a Derivative error message. Since that error message (smthng like "Can't calculate the nth derivative wrt foo") can be rewritten without using an ordinal number (and is removed in a future commit) this function is not necessary.

Should we have it as a utility function?

Other comments

Release Notes

• utilities
  • ordinal will convert an int to its ordinal representation, e.g. 12 -> 12th

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• utilities
  • ordinal will convert an int to its ordinal representation, e.g. 12 -> 12th (#15247 by @smichr)

This will be added to https://github.com/sympy/sympy/wiki/Release-Notes-for-1.4.

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#### References to other Issues or PRs
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#### Brief description of what is fixed or changed

This utility function corrects and extends an inline version that is present in a Derivative error message. Since that error message (smthng like "Can't calculate the nth derivative wrt foo") can be rewritten without using an ordinal number (and is removed in a future commit) this function is not necessary. 

Should we have it as a utility function?

#### Other comments


#### Release Notes

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https://github.com/sympy/sympy/wiki/Writing-Release-Notes for more information
on how to write release notes. The bot will check your release notes
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<!-- BEGIN RELEASE NOTES -->
* utilities
  * ordinal will convert an int to its ordinal representation, e.g. 12 -> 12th

<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[asmeurer]

I'm assuming this is anticipated to be used somewhere else in the codebase. Looks fine to me.