doc: reword description of console.time

PR-URL: https://github.com/nodejs/node/pull/3166
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>

doc/api/console.markdown

@@ -74,16 +74,16 @@ Defaults to `false`. Colors are customizable, see below.
 
 ### console.time(label)
 
-Used to calculate the duration of a specific operation. To start a timer, call
-the `console.time()` method, giving it a name as only parameter. To stop the
-timer, and to get the elapsed time in milliseconds, just call the
-[`console.timeEnd()`](#console_console_timeend_label) method, again passing the
-timer's name as the parameter.
+Starts a timer that can be used to compute the duration of an operation. Timers
+are identified by a unique name. Use the same name when you call
+[`console.timeEnd()`](#console_console_timeend_label) to stop the timer and
+output the elapsed time in milliseconds. Timer durations are accurate to the
+sub-millisecond.
 
 ### console.timeEnd(label)
 
 Stops a timer that was previously started by calling
-[`console.time()`](#console_console_time_label) and print the result to the
+[`console.time()`](#console_console_time_label) and prints the result to the
 console.
 
 Example: