Remove beta tag and updated Pie chart Pie chart topic title (#34019)

* Removed note about pie chart and time series panel being beta.

* Removed v2 from pie chart title.

* Update docs/sources/panels/visualizations/time-series/_index.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

docs/sources/panels/visualizations/pie-chart-panel.md

@@ -4,9 +4,7 @@ keywords = ["grafana", "pie chart"]
 weight = 850
 +++
 
-# Pie chart v2 panel
-
-> **Note:** This documentation refers to a beta feature.
+# Pie chart panel
 
 The pie chart displays reduced series, or values in a series, from one or more queries, as they relate to each other, in the form of slices of a pie. The arc length, area and central angle of a slice are all proportional to the slices value, as it relates to the sum of all values. This type of chart is best used when you want a quick comparison of a small set of values in an aesthetically pleasing form.
 

docs/sources/panels/visualizations/time-series/_index.md

@@ -6,7 +6,7 @@ weight = 1200
 
 # Time series panel
 
-> **Note:** This is a beta feature. Time series panel is going to replace the Graph panel in the future releases.
+> **Note:** Time series panel is going to replace the Graph panel in a future release.
 
 Time series panel is a robust visualization to plot time series data. It can render as a line, a path of dots, or a series of bars. This type of graph is versatile enough to display almost any time-series data.