PWGHF: taskFlow.cxx: Uniformization of the name of the correlation containers (#6715)

* Uniformization of the name of the correlation containers

* ONGOING WORK : Uniformize the name of Correlations containers

* Please consider the following formatting changes

* Solved typos in the declaration of 2 correlation containers

* Corrected a typo

* Typo correction

* Typo correction : everything case can run successfully now

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Co-authored-by: ALICE Action Bot <alibuild@cern.ch>

Author: AlexianL