doc: add args to console methods

doc/api/stdio.markdown

@@ -9,8 +9,7 @@
 For printing to stdout and stderr.  Similar to the console object functions
 provided by most web browsers, here the output is sent to stdout or stderr.
 
-
-## console.log()
+## console.log([data], [...])
 
 Prints to stdout with newline. This function can take multiple arguments in a
 `printf()`-like way. Example:
@@ -21,15 +20,18 @@ If formatting elements are not found in the first string then `util.inspect`
 is used on each argument.
 See [util.format()](util.html#util.format) for more information.
 
-## console.info()
+## console.info([data], [...])
 
 Same as `console.log`.
 
-## console.warn()
-## console.error()
+## console.error([data], [...])
 
 Same as `console.log` but prints to stderr.
 
+## console.warn([data], [...])
+
+Same as `console.error`.
+
 ## console.dir(obj)
 
 Uses `util.inspect` on `obj` and prints resulting string to stdout.
@@ -38,10 +40,9 @@ Uses `util.inspect` on `obj` and prints resulting string to stdout.
 
 Mark a time.
 
-
 ## console.timeEnd(label)
 
-Finish timer, record output. Example
+Finish timer, record output. Example:
 
     console.time('100-elements');
     for (var i = 0; i < 100; i++) {
@@ -49,12 +50,12 @@ Finish timer, record output. Example
     }
     console.timeEnd('100-elements');
 
-
-## console.trace()
+## console.trace(label)
 
 Print a stack trace to stderr of the current position.
 
-## console.assert()
+## console.assert(expression, [message])
 
-Same as `assert.ok()`.
+Same as [assert.ok()](assert.html#assert_assert_value_message_assert_ok_value_message)
+where if the `expression` evaluates as `false` throw an AssertionError with `message`.