doc: Use @env for environment variables.

* doc/guix.texi (Binary Installation):
(Build Environment Setup):
(Invoking guix-daemon):
(Application Setup):
(After System Installation):
(Invoking guix package):
(Proxy Settings):
(Invoking guix environment):
(Packages for C Development):
(Package Modules):
(Build Systems):
(The Store):
(Common Build Options):
(Invoking guix download):
(Invoking guix refresh):
(Using the Configuration System):
(Locales):
(Base Services):
(Networking Services):
(Sound Services):
(Continuous Integration):
(PAM Mount Service):
(X.509 Certificates): Use @env instead of @code for environment variables.

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