Update 'Using the dynamic Toolbar in Theia' title

[vince-fugnitto]

Description

For consistency the dynamic toolbar title should be updated:

Using the dynamic Toolbar > Using the Dynamic Toolbar

theia-website/src/docs/menu.js

Lines 59 to 62 in 231c243

	M(
	'Using the dynamic Toolbar',
	'user_toolbar'
	),

Using the dynamic Toolbar in Theia > Using the Dynamic Toolbar in Theia

theia-website/src/docs/user_toolbar.md

Line 5 in 231c243

# Using the dynamic Toolbar in Theia