doc: reference sourceRoot in description of srcs

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doc
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doc/stdenv/stdenv.chapter.md
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##### `srcs` / `src` {#var-stdenv-src}
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The list of source files or directories to be unpacked or copied. One of these must be set.
##### `sourceRoot` {#var-stdenv-sourceRoot}
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After running `unpackPhase`, the generic builder changes the current directory to the directory created by unpacking the sources. If there are multiple source directories, you should set `sourceRoot` to the name of the intended directory.
##### `setSourceRoot` {#var-stdenv-setSourceRoot}
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##### `srcs` / `src` {#var-stdenv-src}
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The list of source files or directories to be unpacked or copied. One of these must be set. Note that if you use `srcs`, you should also set `sourceRoot` or `setSourceRoot`.
##### `sourceRoot` {#var-stdenv-sourceRoot}
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After running `unpackPhase`, the generic builder changes the current directory to the directory created by unpacking the sources. If there are multiple source directories, you should set `sourceRoot` to the name of the intended directory. Set `sourceRoot = ".";` if you use `srcs` and control the unpack phase yourself.
##### `setSourceRoot` {#var-stdenv-setSourceRoot}