chore: fix histogram type documentation

[TigerHe7]

Fixes: #1426

Issue:
The documentation for the histogram type is incorrect in stating that the explicit bucket boundaries are inclusive upper bounds when they are actually inclusive lower bounds.

Changes:

• Updates comment for histogram type to be accurate
• Adds unit test to demonstrate inclusive lower bound behavior of bucket boundaries

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Tiger He (54bbb5c)

[codecov]

Codecov Report

Merging #1427 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1427      +/-   ##
==========================================
- Coverage   94.10%   94.03%   -0.07%     
==========================================
  Files         145      119      -26     
  Lines        4341     3889     -452     
  Branches      886      824      -62     
==========================================
- Hits         4085     3657     -428     
+ Misses        256      232      -24     

Impacted Files	Coverage Δ
packages/opentelemetry-metrics/src/Meter.ts
...emetry-metrics/src/export/aggregators/Histogram.ts
packages/opentelemetry-metrics/src/Metric.ts
...emetry-metrics/src/export/ConsoleMetricExporter.ts
...s/opentelemetry-metrics/src/BatchObserverResult.ts
...ackages/opentelemetry-metrics/src/MeterProvider.ts
...ackages/opentelemetry-metrics/src/CounterMetric.ts
...trics/src/export/aggregators/MinMaxLastSumCount.ts
...ckages/opentelemetry-metrics/src/ObserverResult.ts
...s/opentelemetry-metrics/src/BatchObserverMetric.ts
... and 16 more