fix wording to better reflect setting functionality
fix wording to better reflect setting functionality

The account setting "Users can edit display name" acutally allows users
to edit their Full Name, Sortable Name, and Display Name. We may want to
revisit whether that's actually valuable functionality, but for now,
let's at least not have the setting text be misleading.

closes CNVS-21328

test plan:
- go to the account settings page
- the setting should read "Users can edit their name"

Change-Id: I2c3f3fdbb7fde91a872bbc791f0d1bb8e2ca2814
Reviewed-on: https://gerrit.instructure.com/56800
Tested-by: Jenkins
Reviewed-by: Dan Minkevitch <2591e5f46f28d303f9dc027d475a5c60d8dea17a@instructure.com>
QA-Review: Clare Strong <40d6bb3ed7fef516c73274131d5a837c16de74fd@instructure.com>
Product-Review: Jason Sparks <542e620f0c6c3447ce6e2e8c83a97102b99f89c6@instructure.com>

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