[clang] [analyzer] Fix double space in generateMinimalDiagForBlockEdge emitted notes (PR #228777)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

Personally I would be happy to see the standardization of sentence spacing (which probably means eliminating French spacing), but @steakhal is right that we should first find out how common is it and perhaps start a discussion, also involving other clang-frontend developers.

https://github.com/llvm/llvm-project/pull/228777