doc: split process.umask() entry into two

Split doc entries for process.umask() into one entry for process.umask()
(which is deprecated) and another for `process.umask(mask)` which is
not deprecated.

PR-URL: #32711
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/deprecations.md

@@ -2646,7 +2646,7 @@ changes:
 
 Type: Documentation-only
 
-Calling `process.umask()` with no arguments causes the process-wide umask to be
+Calling `process.umask()` with no argument causes the process-wide umask to be
 written twice. This introduces a race condition between threads, and is a
 potential security vulnerability. There is no safe, cross-platform alternative
 API.

doc/api/process.md

@@ -2423,7 +2423,7 @@ documentation for the [`'warning'` event][process_warning] and the
 [`emitWarning()` method][process_emit_warning] for more information about this
 flag's behavior.
 
-## `process.umask([mask])`
+## `process.umask()`
 <!-- YAML
 added: v0.1.19
 changes:
@@ -2433,15 +2433,23 @@ changes:
 
 -->
 
-> Stability: 0 - Deprecated. Calling `process.umask()` with no arguments is
-> deprecated. No alternative is provided.
+> Stability: 0 - Deprecated. Calling `process.umask()` with no argument causes
+> the process-wide umask to be written twice. This introduces a race condition
+> between threads, and is a potential security vulnerability. There is no safe,
+> cross-platform alternative API.
+
+`process.umask()` returns the Node.js process's file mode creation mask. Child
+processes inherit the mask from the parent process.
+
+## `process.umask(mask)`
+<!-- YAML
+added: v0.1.19
+-->
 
 * `mask` {string|integer}
 
-The `process.umask()` method sets or returns the Node.js process's file mode
-creation mask. Child processes inherit the mask from the parent process. Invoked
-without an argument, the current mask is returned, otherwise the umask is set to
-the argument value and the previous mask is returned.
+`process.umask(mask)` sets the Node.js process's file mode creation mask. Child
+processes inherit the mask from the parent process. Returns the previous mask.
 
 ```js
 const newmask = 0o022;
@@ -2451,8 +2459,7 @@ console.log(
 );
 ```
 
-[`Worker`][] threads are able to read the umask, however attempting to set the
-umask will result in a thrown exception.
+In [`Worker`][] threads, `process.umask(mask)` will throw an exception.
 
 ## `process.uptime()`
 <!-- YAML