* [csharp] Change enum value suffix name
'enumValueNameSuffix' and 'enumNameSuffix' were introduced in a recent
commit. This changes 'enumValueNameSuffix' to 'enumValueSuffix' to
better differentiate between the two options. This also adds a caveat to
the default description which explains that this flexibility may cause
issues when used by client generator.
* [csharp][aspnetcore] Regenerate samples
