Learn Spelling option gone

Hello dclhoffman, and thank you for using Apple Support Communities.

The feature you're referring to is found in Pages, Keynote and Numbers. This article has more details on how to use this feature: Set up auto-correction and add words to your spelling dictionary in Pages, Numbers, and Keynote - Apple Support

Add words to the spelling dictionary

When Pages, Numbers, or Keynote detects a word that it doesn’t recognize, it underlines the word with a dotted red line. You can add the word to the dictionary on your device so that iWork and other apps recognize the word and includes it in spell check:

On iPad or iPhone, tap the underlined word, then tap Learn Spelling (you may need to tap Replace first). 

On Mac, Control-click the word, then choose Learn Spelling. 

In Pages, Numbers, or Keynote on Mac, you can also choose Ignore Spelling if you no longer want that app to mark this word as misspelled. To add, edit, or remove the words in your iWork app's Ignored Words list, choose Pages > Preferences, choose Auto-Correction, then click Ignored Words. Click the add button (+) or the remove button (-) to add or remove words. Or click on a word to edit its spelling.

You can also review this article for more information about auto-correct and text replacement: How to use Auto-Correction and predictive text on your iPhone, iPad, or iPod touch - Apple Support

Set up text replacement

With text replacement, you can use shortcuts to replace longer phrases. When you enter the shortcut in a text field, the phrase automatically replaces it. For example, you could type "GM" and "Good morning" would automatically replace it. 

To manage text replacement, tap Settings > General > Keyboard > Text Replacement. 

•To add a text replacement, tap the Add button , then enter your phrase and shortcut. When you're done, tap Save. 

•To remove a text replacement, tap Edit, tap the Remove button  then tap Delete. To save your changes, tap Done.

Best regards.