Benchmarks Guide: Update statistical term links (#3531)

docs/benchmarks.adoc

@@ -11,12 +11,18 @@ The format of the benchmarks section is as follows:
 == Benchmark table
 
 - Do not use abbreviations for statistical terms, not everyone is familiar with them.
-- Add links to Wikipedia to explain statistical terms at the header of each column.
+- In the `Benchmarks` section, add a subsection called `Glossary` right after the benchmark table and add links to Wikipedia to explain statistical terms used in the header of each column:
 
-Ideally, the columns should look like the following example:
+==== Glossary
+
+* https://en.wikipedia.org/wiki/Arithmetic_mean[Mean]
+* https://en.wikipedia.org/wiki/Standard_deviation[Standard Deviation]
+* https://en.wikipedia.org/wiki/Memory_management[Allocated]
+
+Ideally, the columns should look like in the following example:
 
 |===
-| <What is being measured> | https://en.wikipedia.org/wiki/Arithmetic_mean[Mean] | https://en.wikipedia.org/wiki/Standard_deviation[Standard Deviation] | https://en.wikipedia.org/wiki/Memory_management[Allocated]
+| <What is being measured> | Mean | Standard Deviation | Allocated
 | <This> | 5.042 ms | 0.1049 ms | 125 KB
 | <That> | 2.691 ms | 0.0334 ms | 85.94 KB
 |===