docs: fix a typo and use milliseconds instead of ms

[vvito7]

Please describe the changes this PR makes and why it should be merged:
This fixes the typo "recieved" to "received" and uses "milliseconds" instead of "ms" (only in docs).

Status and versioning classification:

• This PR only includes non-code changes, like changes to documentation, README, etc.

[almeidx]

There are other places where "ms" is used over "milliseconds"

discord.js/packages/discord.js/src/client/Client.js

Line 536 in db25f52

* number of ms since Discord epoch worker pid increment

discord.js/packages/discord.js/src/rest/RateLimitError.js

Line 18 in db25f52

* Time until this rate limit ends, in ms

discord.js/packages/discord.js/src/rest/RequestHandler.js

Line 283 in db25f52

* @property {number} remainingTime Time in ms remaining before the count resets