Update SearchControl documentation. (#648)
Update SearchControl documentation. (#648)

* Updated docs for layer attribute of SearchControl.

* Added docs for SearchControl layer attribute

* Added documentation for layer attribute of SearchControl

Signed-off-by: Kharude, Sachin <3ca62f1667ea69b5b8d832ccf41c523f6a1638c0@here.com>
ellisonbg/leafletwidget,ellisonbg/leafletwidget