Help: Remove over-precise clause.

Section "Variables References" said that environment and cache
variables are "evaluated in the same contexts as a normal variable
reference". The reader has to guess what "contexts" means in
this context. Probably "inside a Quoted Argument or an Unquoted
Argument", exactly as for ordinary variable references.
But this is exactly what the reader would tacitly assume anyway.
Therefore I think the removed clause was unnecessary, and possibly
more confusing than helpful.

Help/manual/cmake-language.7.rst

@@ -405,12 +405,10 @@ the ``$`` is also technically permitted but is discouraged.
 The `Variables`_ section documents the scope of variable names
 and how their values are set.
 
-An *environment variable reference* has the form ``$ENV{VAR}`` and
-is evaluated in the same contexts as a normal variable reference.
+An *environment variable reference* has the form ``$ENV{VAR}``.
 See :variable:`ENV` for more information.
 
-A *cache variable reference* has the form ``$CACHE{VAR}`` and
-is evaluated in the same contexts as a normal variable reference.
+A *cache variable reference* has the form ``$CACHE{VAR}``.
 See :variable:`CACHE` for more information.
 
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