[squash] Fix typo in documentation

Co-authored-by: Vincenzo Eduardo Padulano <[email protected]>

Author: hageboeck

tree/dataframe/inc/ROOT/RDF/RInterface.hxx

@@ -2361,7 +2361,7 @@ public:
    /// auto myGAE2 = myDf.GraphAsymmErrors<f, f, f, f, f, f>("xValues", "yValues", "exl", "exh", "eyl", "eyh");
    /// ~~~
    ///
-   /// `GraphAssymErrors` should also be used for the cases in which values associated only with
+   /// `GraphAsymmErrors` should also be used for the cases in which values associated only with
    /// one of the axes have associated errors. For example, only `ey` exist and `ex` are equal to zero.
    /// In such cases, user should do the following:
    /// ~~~{.cpp}