docs: improve documentation about macOS entitlement usage security (#30781)

Co-authored-by: ComplexSpaces <[email protected]>

docs/tutorial/code-signing.md

@@ -88,14 +88,15 @@ without meaning any harm:
   <dict>
     <key>com.apple.security.cs.allow-jit</key>
     <true/>
-    <key>com.apple.security.cs.allow-unsigned-executable-memory</key>
-    <true/>
     <key>com.apple.security.cs.debugger</key>
     <true/>
   </dict>
 </plist>
 ```
 
+Note that up until Electron 12, the `com.apple.security.cs.allow-unsigned-executable-memory` entitlement was required
+as well. However, it should not be used anymore if it can be avoided.
+
 To see all of this in action, check out Electron Fiddle's source code,
 [especially its `electron-forge` configuration
 file](https://github.com/electron/fiddle/blob/master/forge.config.js).
@@ -165,14 +166,15 @@ without meaning any harm:
   <dict>
     <key>com.apple.security.cs.allow-jit</key>
     <true/>
-    <key>com.apple.security.cs.allow-unsigned-executable-memory</key>
-    <true/>
     <key>com.apple.security.cs.debugger</key>
     <true/>
   </dict>
 </plist>
 ```
 
+Up until Electron 12, the `com.apple.security.cs.allow-unsigned-executable-memory` entitlement was required
+as well. However, it should not be used anymore if it can be avoided.
+
 ## Mac App Store
 
 See the [Mac App Store Guide].