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doc/stdenv/stdenv: document runHook function (#341972)

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doc/stdenv/stdenv.chapter.md
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@ -1136,6 +1136,12 @@ Example removing all references to the compiler in the output:
}
```
### `runHook` \<hook\> {#fun-runHook}
Execute \<hook\> and the values in the array associated with it. The array's name is determined by removing `Hook` from the end of \<hook\> and appending `Hooks`.
For example, `runHook postHook` would run the hook `postHook` and all of the values contained in the `postHooks` array, if it exists.
### `substitute` \<infile\> \<outfile\> \<subs\> {#fun-substitute}
Performs string substitution on the contents of \<infile\>, writing the result to \<outfile\>. The substitutions in \<subs\> are of the following form: