Document removing and adjusting a periodic callback period

[ahuang11]

While I was creating #573, I thought it'd be nice to modify the periodic callback period or remove it completely.

import panel as pn
import numpy as np
pn.extension()

def generate_random_number(event=None):
    static_text.value = np.random.randint(low=100000, high=200000)

static_text = pn.widgets.StaticText(name='Periodic Random Number Generator',
                                    value='000000')
static_text.add_periodic_callback(generate_random_number,
                                  period=5000)  # period in milliseconds

request_button = pn.widgets.Button(name='Request New Number')
request_button.on_click(generate_random_number)

col = pn.Column(request_button, static_text)
col.servable()

Add something like

static_text.remove_periodic_callback()

Similar to static_text.param.unwatch

Also,

static_text.periodic_callback.period = 1000

Similar to static_text.value = 'something else'

[philippjfr]

This is already possible, just needs to be documented:

callback = static_text.add_periodic_callback(generate_random_number,
                                  period=5000)  # period in milliseconds
callback.stop()

[ahuang11]

#573