add enrol->enroll to en-GB to en-US dictionary

[slitvackwinkler]

Google books graphs source showing that enrol is common in British English while enroll is used in American English: https://books.google.com/ngrams/graph?content=enrol%2Cenroll&year_start=1800&year_end=2019&corpus=en-GB-2019&smoothing=3

[DimitriPapadopoulos]

The main curated dictionaries agree:

• Cambridge US spelling of enrol
• Collins in BRIT, use enrol
• Oxford Learner's enrol (US English enroll)
• Longman enrol British English, enroll American English
• Merriam-Webster enroll or less commonly enrol

[DimitriPapadopoulos]

Thank you @slitvackwinkler.