Fix typo in MIR "cannot move out of borrowed content"

[ritiek]

I believe this all we need to change (#46018). Anyway, do let me know if there is anything else that needs to changed as well!

[rust-highfive]

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[oli-obk]

If no test was impacted by this change, maybe it would be a good idea to add one.

[arielb1]

@oli-obk

We'll have actual UI tests for MIR borrowck soon enough.

@bors r+ rollup

[bors]

📌 Commit 998e3c1 has been approved by arielb1