Fixed typo in template for Text.Json.Serialization.JsonPropertyName

[Voronkov-A]

Just a small fix of typo, introduced by this commit, that leads to code like [System.Text.Json.Serialization.JsonPropertyName("type"] and compilation errors.

[RicoSuter]

Btw, STJ support is just at the beginning (experimental) and some things might not work yet as expected (eg in NSwag I did not even start to using it).

[Voronkov-A]

Btw, STJ support is just at the beginning (experimental) and some things might not work yet as expected (eg in NSwag I did not even start to using it).

I see, thanks. Though, it is enough for what I need now :)