Update the docstring to reflect the changes in the logic

cpp/include/raft/core/detail/nvtx.hpp

@@ -105,14 +105,12 @@ inline auto hsv2rgb(float h, float s, float v) -> uint32_t
 /**
  * @brief Helper method to generate 'visually distinct' colors.
  * Inspired from https://martin.ankerl.com/2009/12/09/how-to-create-random-colors-programmatically/
- * However, if an associated tag is passed, it will look up in its history for
- * any generated color against this tag and if found, just returns it, else
- * generates a new color, assigns a tag to it and stores it for future usage.
+ * It calculates a hash of the passed string and uses the result to generate
+ * distinct yet deterministic colors.
  * Such a thing is very useful for nvtx markers where the ranges associated
  * with a specific tag should ideally get the same color for the purpose of
  * visualizing it on nsight-systems timeline.
- * @param tag look for any previously generated colors with this tag or
- * associate the currently generated color with it
+ * @param tag a string used as an input to generate a distinct color.
  * @return returns 32b RGB integer with alpha channel set of 0xff
  */
 inline auto generate_next_color(const std::string& tag) -> uint32_t