Fixed DatabaseIntrospection.get_relations() docstring.

[timgraham]

The foreign keys are "in" the given table, not "to" it.

[charettes]

Barely related but when reviewing #14878 I've noticed that get_key_columns and get_relations serve the exact same purpose but happen to return the data in different format so it might be worth deprecating one if favor of the other. Also, the whole SQLite implementation that includes complex regexes can be replaced with a simple call to 'PRAGMA foreign_key_list(%s)' % self.connection.ops.quote_name(table_name).

[felixxm]

@timgraham Good catch 🎯 Thanks 👍

[felixxm]

Barely related but when reviewing #14878 I've noticed that get_key_columns and get_relations serve the exact same purpose but happen to return the data in different format so it might be worth deprecating one if favor of the other.

Good idea, see #15075. IMO, we can remove it without a deprecation period.