Fix future tense and add spelling exception

What does this MR do?

Switches future tense to present tense in two documents in the development directory that had PLENTY of incidences.

Adds variations of the word 'transpile' to the spelling exceptions document, since it's a legitimate term in the industry.

Related issues

Related to #284446 (closed)

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• Clear typos, like this is a typpo.
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