doc/adapters.md: mention timeout

note: the end of file change is an unrelated editor artifact. (nvi2)

Author: yamt

Diff for: doc/adapters.md

@@ -32,6 +32,11 @@ The adapter must return exit code to the environment that was passed as an argum
 and check if the exit code is equal to `13`. There are also two test cases in Assembly Script test suite that verify the behavior:
 * [proc_exit-failure](../tests/assemblyscript/testsuite/proc_exit-failure.ts)
 * [proc_exit-success](../tests/assemblyscript/testsuite/proc_exit-success.ts)
+
+On a timeout, the test runner sends SIGTERM singal to the adapter process.
+When receiving the signal, the adapter process should clean up and exit
+as soon as possible.
+
 ### Examples:
 
 Print runtime version:
@@ -61,4 +66,4 @@ See the [`adapters`](../adapters) directory for example adapters.
 
 We prefer runtime maintainers to maintain adapters in their own repository We'll only maintain adapters for [Bytecode Alliance](https://bytecodealliance.org/) projects and we'll aim for compatibility with the most recent stable version.
 
-We'll accept pull requests for new adapters in this repository, but we can't guarantee we'll have the capacity to maintain them (so they might stop working with the new runtime release).
+We'll accept pull requests for new adapters in this repository, but we can't guarantee we'll have the capacity to maintain them (so they might stop working with the new runtime release).