Hotfix:added ZScore related funcs to the doc

• just making assignZScore and flagZScore docs available through TestFunctions->outliers and TestFunctions->scores in the pages by registering them to the outliers.rst file and scores.rst file respectively

docs/funcs/outliers.rst

@@ -19,3 +19,4 @@ outliers
    ~SaQC.flagByGrubbs
    ~SaQC.flagRange
    ~SaQC.flagCrossStatistics
+   ~SaQC.flagZScore