[DOC] Histogram binner incorrect documented number of arguments

[Rongcui Dong]

Report incorrect documentation

Location of incorrect documentation
https://docs.rapids.ai/api/raft/stable/cpp_api/stats_summary/#_CPPv4I000E9histogramvRKN4raft9resourcesE8HistTypeN4raft18device_matrix_viewIK7value_t5idx_tN4raft9col_majorEEEN4raft18device_matrix_viewIi5idx_tN4raft9col_majorEEE9binner_op

Describe the problems or issues found in the documentation

The following line indicates the binner signature:

signature of binner_op is int func(value_t, IdxT);

This is incorrect. Real signature is int binner(value_t value, IdxT row, IdxT col)/

Steps taken to verify documentation is incorrect

• Look at include/raft/stats/histogram.cuh:99

Suggested fix for documentation
Fix signature

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