doc: consistent 'Returns:' part two

Follow up from 8eb19c4. Lower case `return` was not updated

PR-URL: #10391
Ref: #9554
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Julian Duque <julianduquej@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: MylesBorins

doc/api/child_process.md

@@ -318,7 +318,7 @@ added: v0.1.90
     `'/bin/sh'` on UNIX, and `'cmd.exe'` on Windows. A different shell can be
     specified as a string. The shell should understand the `-c` switch on UNIX,
     or `/s /c` on Windows. Defaults to `false` (no shell).
-* return: {ChildProcess}
+* Returns: {ChildProcess}
 
 The `child_process.spawn()` method spawns a new process using the given
 `command`, with command line arguments in `args`. If omitted, `args` defaults
@@ -588,7 +588,7 @@ added: v0.11.12
   * [`maxBuffer`][] {Number} largest amount of data (in bytes) allowed on
     stdout or stderr - if exceeded child process is killed
   * `encoding` {String} The encoding used for all stdio inputs and outputs. (Default: `'buffer'`)
-* return: {Buffer|String} The stdout from the command
+* Returns: {Buffer|String} The stdout from the command
 
 The `child_process.execFileSync()` method is generally identical to
 [`child_process.execFile()`][] with the exception that the method will not return
@@ -631,7 +631,7 @@ added: v0.11.12
     stdout or stderr - if exceeded child process is killed
   * `encoding` {String} The encoding used for all stdio inputs and outputs.
     (Default: `'buffer'`)
-* return: {Buffer|String} The stdout from the command
+* Returns: {Buffer|String} The stdout from the command
 
 The `child_process.execSync()` method is generally identical to
 [`child_process.exec()`][] with the exception that the method will not return until
@@ -673,7 +673,7 @@ added: v0.11.12
     `'/bin/sh'` on UNIX, and `'cmd.exe'` on Windows. A different shell can be
     specified as a string. The shell should understand the `-c` switch on UNIX,
     or `/s /c` on Windows. Defaults to `false` (no shell).
-* return: {Object}
+* Returns: {Object}
   * `pid` {Number} Pid of the child process
   * `output` {Array} Array of results from stdio output
   * `stdout` {Buffer|String} The contents of `output[1]`

doc/api/domain.md

@@ -257,7 +257,7 @@ serverDomain.run(() => {
 
 ## domain.create()
 
-* return: {Domain}
+* Returns: {Domain}
 
 Returns a new Domain object.
 
@@ -338,7 +338,7 @@ specified emitter.
 ### domain.bind(callback)
 
 * `callback` {Function} The callback function
-* return: {Function} The bound function
+* Returns: {Function} The bound function
 
 The returned function will be a wrapper around the supplied callback
 function.  When the returned function is called, any errors that are
@@ -366,7 +366,7 @@ d.on('error', (er) => {
 ### domain.intercept(callback)
 
 * `callback` {Function} The callback function
-* return: {Function} The intercepted function
+* Returns: {Function} The intercepted function
 
 This method is almost identical to [`domain.bind(callback)`][].  However, in
 addition to catching thrown errors, it will also intercept [`Error`][]