Add missing return types in YARD documentation

- Add [void] return type for all database operation methods
- Add proper return types for Configuration accessors

Author: teoljungberg

lib/fx/configuration.rb

@@ -4,15 +4,15 @@ class Configuration
     # The F(x) database adapter instance to use when executing SQL.
     #
     # Defaults to an instance of {Fx::Adapters::Postgres}
-    # @return Fx adapter
+    # @return [Fx::Adapters::Postgres] Fx adapter
     attr_accessor :database
 
     # Prioritizes the order in the schema.rb of functions before other
     # statements in order to make directly schema load work when using functions
     # in statements below, i.e.: default column values.
     #
     # Defaults to false
-    # @return Boolean
+    # @return [Boolean] Boolean
     attr_accessor :dump_functions_at_beginning_of_schema
 
     def initialize

lib/fx/statements.rb

@@ -10,7 +10,7 @@ module Statements
     # @param sql_definition [String] The SQL query for the function schema.
     #   If both `sql_definition` and `version` are provided,
     #   `sql_definition` takes precedence.
-    # @return The database response from executing the create statement.
+    # @return [void] The database response from executing the create statement.
     #
     # @example Create from `db/functions/uppercase_users_name_v02.sql`
     #   create_function(:uppercase_users_name, version: 2)
@@ -42,7 +42,7 @@ def create_function(name, options = {})
     # @param revert_to_version [Integer] Used to reverse the `drop_function`
     #   command on `rake db:rollback`. The provided version will be passed as
     #   the `version` argument to {#create_function}.
-    # @return The database response from executing the drop statement.
+    # @return [void] The database response from executing the drop statement.
     #
     # @example Drop a function, rolling back to version 2 on rollback
     #   drop_function(:uppercase_users_name, revert_to_version: 2)
@@ -60,7 +60,7 @@ def drop_function(name, options = {})
     # @param sql_definition [String] The SQL query for the function schema.
     #   If both `sql_definition` and `version` are provided,
     #   `sql_definition` takes precedence.
-    # @return The database response from executing the create statement.
+    # @return [void] The database response from executing the create statement.
     #
     # @example Update function to a given version
     #   update_function(
@@ -100,7 +100,7 @@ def update_function(name, options = {})
     # @param sql_definition [String] The SQL query for the function. An error
     #   will be raised if `sql_definition` and `version` are both set,
     #   as they are mutually exclusive.
-    # @return The database response from executing the create statement.
+    # @return [void] The database response from executing the create statement.
     #
     # @example Create trigger from `db/triggers/uppercase_users_name_v01.sql`
     #   create_trigger(:uppercase_users_name, version: 1)
@@ -134,7 +134,7 @@ def create_trigger(name, options = {})
     # @param revert_to_version [Integer] Used to reverse the `drop_trigger`
     #   command on `rake db:rollback`. The provided version will be passed as
     #   the `version` argument to {#create_trigger}.
-    # @return The database response from executing the drop statement.
+    # @return [void] The database response from executing the drop statement.
     #
     # @example Drop a trigger, rolling back to version 3 on rollback
     #   drop_trigger(:log_inserts, on: :users, revert_to_version: 3)
@@ -158,7 +158,7 @@ def drop_trigger(name, options = {})
     #   as they are mutually exclusive.
     # @param revert_to_version [Integer] The version number to rollback to on
     #   `rake db rollback`
-    # @return The database response from executing the create statement.
+    # @return [void] The database response from executing the create statement.
     #
     # @example Update trigger to a given version
     #   update_trigger(