fix(Formatters): add newline in codeBlock

[kyranet]

Please describe the changes this PR makes and why it should be merged:

Adds a newline at the end of the codeblock, fixes #8368.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

[vercel]

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Name	Status	Preview	Updated
discord-js	✅ Ready (Inspect)	Visit Preview	Jul 26, 2022 at 7:59AM (UTC)

[codecov]

Codecov Report

Merging #8369 (fbf2577) into main (1275918) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #8369   +/-   ##
=======================================
  Coverage   86.40%   86.40%           
=======================================
  Files          87       87           
  Lines        8221     8221           
  Branches     1098     1098           
=======================================
  Hits         7103     7103           
  Misses       1075     1075           
  Partials       43       43           

Flag	Coverage Δ
builders	100.00% <100.00%> (ø)
collection	100.00% <ø> (ø)
proxy	73.28% <ø> (ø)
rest	92.53% <ø> (ø)
utilities	100.00% <ø> (ø)
voice	64.08% <ø> (ø)
ws	60.26% <ø> (ø)

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Impacted Files	Coverage Δ
packages/builders/src/messages/formatters.ts	100.00% <100.00%> (ø)

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