Rename "Frequency of Updates" Parameter to "Update Interval (ms)"

[cdutr]

The current parameter name "Frequency of Updates (The frequency of updates for the GPU Dashboard widgets, in milliseconds.)" is misleading because frequency is measured is mesuared in 1/period, like Hz. However, the value is actually given in milliseconds, which indicates a period rather than a frequency. To improve clarity and accuracy, I propose renaming the parameter to "Update Interval (ms)".