doc: mark process.loadEnvFile and util.parseEnv as stable

Author: Hilzu

doc/api/process.md

@@ -2696,10 +2696,12 @@ debugger. See [Signal Events][].
 added:
   - v21.7.0
   - v20.12.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/59925
+    description: This API is no longer experimental.
 -->
 
-> Stability: 1.1 - Active development
-
 * `path` {string | URL | Buffer | undefined}. **Default:** `'./.env'`
 
 Loads the `.env` file into `process.env`. Usage of `NODE_OPTIONS`

doc/api/util.md

@@ -2211,10 +2211,12 @@ $ node negate.js --no-logfile --logfile=test.log --color --no-color
 added:
   - v21.7.0
   - v20.12.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/59925
+    description: This API is no longer experimental.
 -->
 
-> Stability: 1.1 - Active development
-
 * `content` {string}
 
 The raw contents of a `.env` file.