Update metrics_sdk/lib/opentelemetry/sdk/metrics/aggregation/histogra…

…m_data_point.rb

Co-authored-by: Kayla Reopelle <87386821+kaylareopelle@users.noreply.github.com>

metrics_sdk/lib/opentelemetry/sdk/metrics/aggregation/histogram_data_point.rb

@@ -14,7 +14,7 @@ module Aggregation
                                         :start_time_unix_nano,  # Integer nanoseconds since Epoch
                                         :time_unix_nano,        # Integer nanoseconds since Epoch
                                         :count,                 # Integer count is the number of values in the population. Must be non-negative.
-                                        :sum,                   # Float sum of the values in the population. If count is zero then this field then this field must be zero
+                                        :sum,                   # Float sum of the values in the population. If count is zero then this field must be zero.
                                         :bucket_counts,         # optional Array[Integer] field contains the count values of histogram for each bucket.
                                         :explicit_bounds,       # Array[Float] specifies buckets with explicitly defined bounds for values.
                                         :exemplars,             # optional List of exemplars collected from measurements that were used to form the data point