fix quniform issue ; change related doc

[suiguoxin]

#1377

[QuanluZhang]

please check all the tuners and advisors to see whether these changes take effect, as some tuners/advisors may not use the changed function.

[suiguoxin]

please check all the tuners and advisors to see whether these changes take effect, as some tuners/advisors may not use the changed function.
Quite different among different tuners, i.e.:
Hyperband/GPTuner/evolution_tuner: parameter_expression used
BOHB: Package Configspace used, no difference between qloguniform/ quniform