Change hit to press

[astroDimitrios]

Closes #858

Replaces the 3 instances of the word hit with press in relation to pressing keys.

[github-actions[bot]]

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[martinosorb]

@astroDimitrios was this (and #1008) closed inadvertently?

[astroDimitrios]

@martinosorb Ah yes - I had to delete my forked copy to do some office work on their fork of the same repo, I will try and reopen these on the Met Office version in the next few weeks.