doc: copyedit util doc

Add verbs to make sentence fragments less fragmentary.

PR-URL: #5399
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>

Author: Trott

doc/api/util.markdown

@@ -254,7 +254,7 @@ util.inspect(obj);
 
 Internal alias for [`Array.isArray`][].
 
-Returns `true` if the given "object" is an `Array`. `false` otherwise.
+Returns `true` if the given "object" is an `Array`. Otherwise, returns `false`.
 
 ```js
 const util = require('util');
@@ -271,7 +271,7 @@ util.isArray({})
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is a `Boolean`. `false` otherwise.
+Returns `true` if the given "object" is a `Boolean`. Otherwise, returns `false`.
 
 ```js
 const util = require('util');
@@ -288,7 +288,7 @@ util.isBoolean(false)
 
     Stability: 0 - Deprecated: Use [`Buffer.isBuffer()`][] instead.
 
-Returns `true` if the given "object" is a `Buffer`. `false` otherwise.
+Returns `true` if the given "object" is a `Buffer`. Otherwise, returns `false`.
 
 ```js
 const util = require('util');
@@ -305,7 +305,7 @@ util.isBuffer(new Buffer('hello world'))
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is a `Date`. `false` otherwise.
+Returns `true` if the given "object" is a `Date`. Otherwise, returns `false`.
 
 ```js
 const util = require('util');
@@ -322,7 +322,8 @@ util.isDate({})
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is an [`Error`][]. `false` otherwise.
+Returns `true` if the given "object" is an [`Error`][]. Otherwise, returns
+`false`.
 
 ```js
 const util = require('util');
@@ -339,7 +340,8 @@ util.isError({ name: 'Error', message: 'an error occurred' })
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is a `Function`. `false` otherwise.
+Returns `true` if the given "object" is a `Function`. Otherwise, returns
+`false`.
 
 ```js
 const util = require('util');
@@ -359,7 +361,8 @@ util.isFunction(Bar)
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is strictly `null`. `false` otherwise.
+Returns `true` if the given "object" is strictly `null`. Otherwise, returns
+`false`.
 
 ```js
 const util = require('util');
@@ -376,7 +379,8 @@ util.isNull(null)
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is `null` or `undefined`. `false` otherwise.
+Returns `true` if the given "object" is `null` or `undefined`. Otherwise,
+returns `false`.
 
 ```js
 const util = require('util');
@@ -393,7 +397,7 @@ util.isNullOrUndefined(null)
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is a `Number`. `false` otherwise.
+Returns `true` if the given "object" is a `Number`. Otherwise, returns `false`.
 
 ```js
 const util = require('util');
@@ -413,7 +417,7 @@ util.isNumber(NaN)
     Stability: 0 - Deprecated
 
 Returns `true` if the given "object" is strictly an `Object` __and__ not a
-`Function`. `false` otherwise.
+`Function`. Otherwise, returns `false`.
 
 ```js
 const util = require('util');
@@ -432,7 +436,8 @@ util.isObject(function(){})
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is a primitive type. `false` otherwise.
+Returns `true` if the given "object" is a primitive type. Otherwise, returns
+`false`.
 
 ```js
 const util = require('util');
@@ -461,7 +466,7 @@ util.isPrimitive(new Date())
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is a `RegExp`. `false` otherwise.
+Returns `true` if the given "object" is a `RegExp`. Otherwise, returns `false`.
 
 ```js
 const util = require('util');
@@ -478,7 +483,7 @@ util.isRegExp({})
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is a `String`. `false` otherwise.
+Returns `true` if the given "object" is a `String`. Otherwise, returns `false`.
 
 ```js
 const util = require('util');
@@ -497,7 +502,7 @@ util.isString(5)
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is a `Symbol`. `false` otherwise.
+Returns `true` if the given "object" is a `Symbol`. Otherwise, returns `false`.
 
 ```js
 const util = require('util');
@@ -514,7 +519,7 @@ util.isSymbol(Symbol('foo'))
 
     Stability: 0 - Deprecated
 
-Returns `true` if the given "object" is `undefined`. `false` otherwise.
+Returns `true` if the given "object" is `undefined`. Otherwise, returns `false`.
 
 ```js
 const util = require('util');