[Chapel Merge] Fix formatting of `--fast` in List docs

Branch: refs/heads/main
Revision: 171a1b974b9e163e2fc21889139257344b38d733
Author: jabraham17
Link: Fix formatting of `--fast` in List docs by jabraham17 · Pull Request #28693 · chapel-lang/chapel · GitHub
Log Message:
Fix formatting of --fast in List docs (#28693)

Fixes the formatting of --fast in the List docs.

Since before it was only using a single backtick, the -- for the flag
would be rendered as a long dash, not two short dashes

The fix is to properly use two backticks

[Not reviewed - trivial]

Compare: Comparing cf89e76b42636962f198992fe0d32340863ff376...9e83834f0b4a35ecd2612a6ad81a3f2e84256433 · chapel-lang/chapel · GitHub

Diff:
M modules/standard/List.chpl
https://github.com/chapel-lang/chapel/pull/28693.diff