chore: updates for v2 changes

[calmh]

wip

[tomasz1986]

Would you also be able to update the build instructions at https://docs.syncthing.net/dev/building with information on requiring CGO_ENABLED and everything else that is needed for the new database?

[marbens-arch]

diff --git a/users/releases.rst b/users/releases.rst
index 1690376..58db561 100644
--- a/users/releases.rst
+++ b/users/releases.rst
@@ -16,7 +16,7 @@ following criteria:
 
 - Is the new version protocol incompatible with the previous one, so that
   they cannot connect to each other or otherwise can't sync files for some
-  reason? That's a new *major* version. (This hasn't happened yet.)
+  reason? That's a new *major* version.
 
 - Are there changes in the REST API so that integrations or wrappers
   need changes, or did the database schema or configuration change so that a

[calmh]

Well the version incompatibility hasn't happened yet, but if it did it would be another major version 😅