Fix documentation of interface command-line parameters

[Penguin-Guru]

https://github.com/vircadia/vircadia/pull/1428/files

// The documented "--disable-lod" does not seem to exist.
// Below are undocumented.
QCommandLineOption noLauncherOption("no-launcher", "Do not execute the launcher.");
QCommandLineOption overrideScriptsPathOption(SCRIPTS_SWITCH, "set scripts <path>", "path");
QCommandLineOption defaultScriptOverrideOption("defaultScriptsOverride", "override defaultsScripts.js.", "string");
QCommandLineOption responseTokensOption("tokens", "set response tokens <json>.", "json");
QCommandLineOption displayNameOption("displayName", "set user display name <string>.", "string");
// "--traceFile". In my pull request, I change handling for this and add a related parameter "--traceDuration".
// "--clockSkew". I'm not sure if this is still useful for anything.
// "--qmljsdebugger", which appears in output from "--help-all".

Here are additional undocumented parameters I found (not all tested). See my pull request for definitions.
--no-login-suggestion
--traceFile (and in my pull request I add "--traceDuration" to replace some "--traceFile" functionality)
--clockSkew
--testScript
--testResultsLocation
--quitWhenFinished
--fast-heartbeat

Also, "--protocolVersion", which is currently documented, only seems to write to a file (which is a required parameter that must follow it). It does not "display" the output.

[Penguin-Guru]

I think it's very important that the descriptions be clear, distinct, complete, and the same in the (online) documentation and --help output. Since descriptions have not been provided for these parameters in the documentation or on this issue and Dale has already offered some revisions to the tentative descriptions I added in my pull request, I am going to consider those descriptions locked-in. Look there for current --help descriptions.