System.Job: Fix documents

doc/vital/System/Job.txt

@@ -16,14 +16,14 @@ INSTANCE				|Vital.System.Job-instance|
 =============================================================================
 INTRODUCTION					*Vital.System.Job-introduction*
 
-*Vital.System.Job* is a wrapper module of job feature which has introduced
-from Vim 8 or Neovim.
+*Vital.System.Job* is a wrapper module of the |job| feature to provide an
+abstract layer that works both for Vim 8 and Neovim at the same time.
 
 =============================================================================
 USAGE						*Vital.System.Job-usage*
 
-The following code start "git status" and store its' stdout/stderr output in
-the instance attribute.
+The following code starts "git status" and stores its stdout/stderr output
+in the instance attribute.
 >
 	function! s:on_stdout(job, msg, event) abort dict
 	  let leading = get(self.stdout, -1, '')
@@ -67,13 +67,13 @@ start({args}[, {options}])
 	The following attributes are allowed in {options}.
 
 	"on_stdout"	A callback called when the process output to stdout.
-			The {msg} is a stdout data |List|, and
+			The {msg} is a stdout data |List|.
 	"on_stderr"	A callback called when the process output to stderr.
 			The {msg} is a stderr data |List|.
 	"on_exit"	A callback called when the process terminated.
 			The {msg} is an exit status.
 
-	Note that all attributes in the {options} is exposed to the job
+	Note that all attributes in the {options} are exposed to the job
 	instance and users can access that in callbacks by |self| while the
 	callbacks above are called as a dictionary function of the job
 	instance.
@@ -86,7 +86,7 @@ INSTANCE					*Vital.System.Job-instance*
 
 					*Vital.System.Job-instance.id()*
 id()
-	Return an unique number of the process.
+	Return a unique number of the process.
 
 					*Vital.System.Job-instance.status()*
 status()
@@ -123,8 +123,8 @@ wait([{timeout}])
 	The unit of {timeout} is milliseconds.
 	When user hit <C-c>, the process will terminate.
 
-	Warning: Vim 8.0.0026 and earlier is not supported and will throws
-	an exception when this method has called.
+	Warning: Vim 8.0.0026 or earlier is not supported and will throws
+	an exception when this method has been called.
 
 
 =============================================================================

test/System/Process/System.vimspec

@@ -137,7 +137,7 @@ Describe System.Process.System
                 \ Process.execute([], options)
         End
 
-        It DOES NOT throws an exception when {options.background} is specified
+        It DOES NOT throw an exception when {options.background} is specified
           let options.background = 1
           let args = ['false']
           let result = Process.execute(args, options)