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20ff2fcc18
The doc about DDL statements claims that an `ALTER KEYSPACE` will fail in the presence of an ongoing global topology operation. This limitation was specifically referring to RF changes, which Scylla implements as global topology requests (`keyspace_rf_change`), and it was true when it was first introduced (1b913dd880) because there was no global topology request queue at that time, so only one ongoing global request was allowed in the cluster. This limitation was lifted with the introduction of the global topology request queue (6489308ebc), and it was re-introduced again very recently (2e7ba1f8ce) in a slightly different form; it now applies only to RF changes (not to any request type) and only those that affect the same keyspace. None of these two changes were ever reflected in the doc. Synchronize the doc with the current state. Fixes #27776. Signed-off-by: Nikos Dragazis <nikolaos.dragazis@scylladb.com> Closes scylladb/scylladb#27786