remove the last mention to let-env (#10718)

# Description
just caught a last mention to `let-env` in the `CONTRIBUTING.md`
document 😋

# User-Facing Changes

# Tests + Formatting

# After Submitting
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Antoine Stevan 2023-10-18 23:15:04 +02:00 committed by GitHub
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@ -118,7 +118,7 @@ is described below:
Use `export def` to make these names public to your users.
* If your command is updating environment variables, you must use
`export def --env` (instead of `export def`) to define the subcommand,
`export-env {}` to initialize the environment variables and `let-env` to
`export-env {}` to initialize the environment variables and `$env.VAR = val` to
update them. For an example of a custom command which modifies
environment variables, see: `./crates/nu-std/lib/dirs.nu`.
For an example of a custom command which does *not* modify environment