docs: switch gracefulShutdown to primarily mention SIGTERM and add Docker comment

docs/src/test-api/class-testconfig.md

@@ -629,7 +629,7 @@ export default defineConfig({
   - `stdout` ?<["pipe"|"ignore"]> If `"pipe"`, it will pipe the stdout of the command to the process stdout. If `"ignore"`, it will ignore the stdout of the command. Default to `"ignore"`.
   - `stderr` ?<["pipe"|"ignore"]> Whether to pipe the stderr of the command to the process stderr or ignore it. Defaults to `"pipe"`.
   - `timeout` ?<[int]> How long to wait for the process to start up and be available in milliseconds. Defaults to 60000.
-  - `gracefulShutdown` ?<[Object]> How to shut down the process. If unspecified, the process group is forcefully `SIGKILL`ed. If set to `{ signal: 'SIGINT', timeout: 500 }`, the process group is sent a `SIGINT` signal, followed by `SIGKILL` if it doesn't exit within 500ms. You can also use `SIGTERM` instead. A `0` timeout means no `SIGKILL` will be sent. Windows doesn't support `SIGINT` and `SIGTERM` signals, so this option is ignored.
+  - `gracefulShutdown` ?<[Object]> How to shut down the process. If unspecified, the process group is forcefully `SIGKILL`ed. If set to `{ signal: 'SIGTERM', timeout: 500 }`, the process group is sent a `SIGTERM` signal, followed by `SIGKILL` if it doesn't exit within 500ms. You can also use `SIGINT` as the signal instead. A `0` timeout means no `SIGKILL` will be sent. Windows doesn't support `SIGTERM` and `SIGINT` signals, so this option is ignored on Windows. Note that shutting down a Docker container requires `SIGTERM`.
     - `signal` <["SIGINT"|"SIGTERM"]>
     - `timeout` <[int]> 
   - `url` ?<[string]> The url on your http server that is expected to return a 2xx, 3xx, 400, 401, 402, or 403 status code when the server is ready to accept connections. Redirects (3xx status codes) are being followed and the new location is checked. Either `port` or `url` should be specified.

docs/src/test-webserver-js.md

@@ -37,7 +37,7 @@ export default defineConfig({
 | `stdout` | If `"pipe"`, it will pipe the stdout of the command to the process stdout. If `"ignore"`, it will ignore the stdout of the command. Default to `"ignore"`. |
 | `stderr` | Whether to pipe the stderr of the command to the process stderr or ignore it. Defaults to `"pipe"`. |
 | `timeout` | How long to wait for the process to start up and be available in milliseconds. Defaults to 60000. |
-| `gracefulShutdown` | How to shut down the process. If unspecified, the process group is forcefully `SIGKILL`ed. If set to `{ signal: 'SIGINT', timeout: 500 }`, the process group is sent a `SIGINT` signal, followed by `SIGKILL` if it doesn't exit within 500ms. You can also use `SIGTERM` instead. A `0` timeout means no `SIGKILL` will be sent. Windows doesn't support `SIGINT` and `SIGTERM` signals, so this option is ignored. |
+| `gracefulShutdown` | How to shut down the process. If unspecified, the process group is forcefully `SIGKILL`ed. If set to `{ signal: 'SIGTERM', timeout: 500 }`, the process group is sent a `SIGTERM` signal, followed by `SIGKILL` if it doesn't exit within 500ms. You can also use `SIGINT` as the signal instead. A `0` timeout means no `SIGKILL` will be sent. Windows doesn't support `SIGTERM` and `SIGINT` signals, so this option is ignored on Windows. Note that shutting down a Docker container requires `SIGTERM`. |
 
 ## Adding a server timeout
 

packages/playwright/types/test.d.ts

@@ -9645,9 +9645,10 @@ interface TestConfigWebServer {
 
   /**
    * How to shut down the process. If unspecified, the process group is forcefully `SIGKILL`ed. If set to `{ signal:
-   * 'SIGINT', timeout: 500 }`, the process group is sent a `SIGINT` signal, followed by `SIGKILL` if it doesn't exit
-   * within 500ms. You can also use `SIGTERM` instead. A `0` timeout means no `SIGKILL` will be sent. Windows doesn't
-   * support `SIGINT` and `SIGTERM` signals, so this option is ignored.
+   * 'SIGTERM', timeout: 500 }`, the process group is sent a `SIGTERM` signal, followed by `SIGKILL` if it doesn't exit
+   * within 500ms. You can also use `SIGINT` as the signal instead. A `0` timeout means no `SIGKILL` will be sent.
+   * Windows doesn't support `SIGTERM` and `SIGINT` signals, so this option is ignored on Windows. Note that shutting
+   * down a Docker container requires `SIGTERM`.
    */
   gracefulShutdown?: {
     signal: "SIGINT"|"SIGTERM";