doc/stdenv: document prefixKey more precisely (#302535)

* doc/stdenv: document prefixKey more precisely

Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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@ -797,7 +797,7 @@ A shell array containing additional arguments passed to the configure script. Yo
##### `dontAddPrefix` {#var-stdenv-dontAddPrefix}
By default, the flag `--prefix=$prefix` is added to the configure flags. If this is undesirable, set this variable to true.
By default, `./configure` is passed the concatenation of [`prefixKey`](#var-stdenv-prefixKey) and [`prefix`](#var-stdenv-prefix) on the command line. Disable this by setting `dontAddPrefix` to `true`.
##### `prefix` {#var-stdenv-prefix}
@ -805,7 +805,7 @@ The prefix under which the package must be installed, passed via the `--prefix`
##### `prefixKey` {#var-stdenv-prefixKey}
The key to use when specifying the prefix. By default, this is set to `--prefix=` as that is used by the majority of packages.
The key to use when specifying the installation [`prefix`](#var-stdenv-prefix). By default, this is set to `--prefix=` as that is used by the majority of packages. Other packages may need `--prefix ` (with a trailing space) or `PREFIX=`.
##### `dontAddStaticConfigureFlags` {#var-stdenv-dontAddStaticConfigureFlags}