Apply suggestions from code review

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@ -38,8 +38,7 @@ The following are all examples of valid BCP 47 tags:
### The language subtag
The only required option is the Language subtag, which is an [ISO 639-1][2] or
[ISO 639-3][3] code. Essentially, it is an [ISO-639][4] that uses two-letter and three-letter codes.
The only required option is the Language subtag, which is an [ISO 639][4] code. If a two-letter code[ISO 639-1][2] is available, it is used instead of the three-letter code [ISO 639-3][3].
First, try to find your language on the list of two-letter ISO 639-1 codes.
[This Wikipedia page][5] lists all of the two-letter codes. If the two-letter code is available, it is used instead of the three-letter code.