Help Wanted: Document WebappUtils exported for plugins

[mattermod]

This pr mattermost/mattermost-webapp#4778 add the WebappUtils, with specifically browserHistory, to the web app export available for plugins.

We need to document this in the Web App reference here: https://developers.mattermost.com/extend/plugins/webapp/reference/#exported-libraries-and-functions, and preferably with an example on how to use to it to navigate internal links.

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JIRA: https://mattermost.atlassian.net/browse/MM-23792

[ghost]

Any update on this?

[cwarnermm]

@marianunez - This Help Wanted ticket has been sitting for some time. Would you or a member of your team be open to creating a PR with the necessary documentation updates to developers.mattermost.com?

[cwarnermm]

@hmhealey - Is this ticket something we could tackle as part of monthly developer documentation maintenance updates perhaps?

[hmhealey]

I'm not sure. It's not really in my wheelhouse since it's part of the plugin API, but I could probably take a look at it if we don't have an owner for it currently