Added information about what a Gen X column means

[jigargandhi]

Added information about what a Gen X means. Right now the definition is ambiguous of whether it is the number of objects in that generation or the number of collections in that generation

[AndreyAkinshin]

Hey @jigargandhi! Thanks for the PR.
Indeed, it makes sense to add extra information about "Gen X" columns in the documentation. However, the new sentence is not completely correct. We should remove the "to clean up memory" part because a GC collection doesn't always clean up memory. This column shows the number of GC Generation collects per 1000 operations. We print this information below the summary table in the legend section:

BenchmarkDotNet/src/BenchmarkDotNet/Diagnosers/MemoryDiagnoser.cs

Line 65 in 0a4550f

Legend = $"GC Generation {generationId} collects per 1000 operations";

[AndreyAkinshin]

Hey @jigargandhi! Would you like to update your PR?

[jigargandhi]

Hey, yes I will update it in a day or two

…

On Sat, 13 Jul 2019, 20:54 Andrey Akinshin, ***@***.***> wrote: Hey @jigargandhi <https://github.com/jigargandhi>! Would you like to update your PR? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1175?email_source=notifications&email_token=AAC46MMY3DELMYEBO74PWW3P7HXTPA5CNFSM4HSFBOU2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODZ3TVIQ#issuecomment-511130274>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAC46MPNUEUZBDU4IKYZO5DP7HXTPANCNFSM4HSFBOUQ> .

[AndreyAkinshin]

@jigargandhi the new version is still not correct. This column displays the number of collections per 1000 operations.

[AndreyAkinshin]

Also, the current sentence doesn't have a mention of GC (the corresponding line in the legend has this information: "GC Generation {generationId} collects per 1000 operations"); a period at the end of the sentence is missing.

[AndreyAkinshin]

@jigargandhi thanks!