MouseEventManager description: fix outdated function name in code example
MouseEventManager description: fix outdated function name in code example

IBwWG/haxeflixel.com,gamedevsam/haxeflixel.com,IBwWG/haxeflixel.com,IBwWG/haxeflixel.com,joackobengochea/haxeflixel.com,gamedevsam/haxeflixel.com,whilesoftware/haxeflixel.com,whilesoftware/haxeflixel.com,gamedevsam/haxeflixel.com,joackobengochea/haxeflixel.com,whilesoftware/haxeflixel.com,joackobengochea/haxeflixel.com