doc: clarify that APIs are no longer experimental

Change "no longer considered experimental" to "no longer experimental".
It's more clear and direct.

PR-URL: #34113
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Zeyu Yang <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: Trott

doc/api/process.md

@@ -1794,7 +1794,7 @@ added: v11.8.0
 changes:
   - version: v13.12.0
     pr-url: https://github.com/nodejs/node/pull/32242
-    description: This API is no longer considered experimental.
+    description: This API is no longer experimental.
 -->
 
 * {Object}
@@ -1824,7 +1824,7 @@ added: v11.12.0
 changes:
   - version: v13.12.0
     pr-url: https://github.com/nodejs/node/pull/32242
-    description: This API is no longer considered experimental.
+    description: This API is no longer experimental.
 -->
 
 * {string}
@@ -1843,7 +1843,7 @@ added: v11.12.0
 changes:
   - version: v13.12.0
     pr-url: https://github.com/nodejs/node/pull/32242
-    description: This API is no longer considered experimental.
+    description: This API is no longer experimental.
 -->
 
 * {string}
@@ -1862,7 +1862,7 @@ added: v11.8.0
 changes:
   - version: v13.12.0
     pr-url: https://github.com/nodejs/node/pull/32242
-    description: This API is no longer considered experimental.
+    description: This API is no longer experimental.
 -->
 
 * `err` {Error} A custom error used for reporting the JavaScript stack.
@@ -1905,7 +1905,7 @@ added: v11.12.0
 changes:
   - version: v13.12.0
     pr-url: https://github.com/nodejs/node/pull/32242
-    description: This API is no longer considered experimental.
+    description: This API is no longer experimental.
 -->
 
 * {boolean}
@@ -1923,7 +1923,7 @@ added: v11.12.0
 changes:
   - version: v13.12.0
     pr-url: https://github.com/nodejs/node/pull/32242
-    description: This API is no longer considered experimental.
+    description: This API is no longer experimental.
 -->
 
 * {boolean}
@@ -1940,7 +1940,7 @@ added: v11.12.0
 changes:
   - version: v13.12.0
     pr-url: https://github.com/nodejs/node/pull/32242
-    description: This API is no longer considered experimental.
+    description: This API is no longer experimental.
 -->
 
 * {string}
@@ -1958,7 +1958,7 @@ added: v11.8.0
 changes:
   - version: v13.12.0
     pr-url: https://github.com/nodejs/node/pull/32242
-    description: This API is no longer considered experimental.
+    description: This API is no longer experimental.
 -->
 
 * `filename` {string} Name of the file where the report is written. This