Doc: config.yaml mention $env (#34905)
Add one more note on the $env variable in `config.yaml`.
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		| @@ -54,6 +54,11 @@ config: | |||||||
|   # are that it precludes its use as a system package and its ability to be |   # are that it precludes its use as a system package and its ability to be | ||||||
|   # pip installable. |   # pip installable. | ||||||
|   # |   # | ||||||
|  |   # In Spack environment files, chaining onto existing system Spack | ||||||
|  |   # installations, the $env variable can be used to download, cache and build | ||||||
|  |   # into user-writable paths that are relative to the currently active | ||||||
|  |   # environment. | ||||||
|  |   # | ||||||
|   # In any case, if the username is not already in the path, Spack will append |   # In any case, if the username is not already in the path, Spack will append | ||||||
|   # the value of `$user` in an attempt to avoid potential conflicts between |   # the value of `$user` in an attempt to avoid potential conflicts between | ||||||
|   # users in shared temporary spaces. |   # users in shared temporary spaces. | ||||||
|   | |||||||
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	 Axel Huebl
					Axel Huebl