For those who use vscode to write their vex code, I've just published a small vscode extension "Houdini vex help [marketplace.visualstudio.com]" which mimics the wrangle nodes behavior "Open help page from selected text", inside vscode directly.
Install the extension from the marketplace, select a function name in your code, execute the command "Open vex help", or press F2 and voila !
It's particulary useful with the great support of VEX language support f [marketplace.visualstudio.com]or vscode by mel massadian and houdini expr editor from cgtoolbox.com [cgtoolbox.com].
Guillaume