remove meaningless use of Relation#all

particularly, `all(options)` would warn

activerecord/lib/active_record/aggregations.rb

@@ -165,7 +165,7 @@ def clear_aggregation_cache #:nodoc:
     # by specifying an instance of the value object in the conditions hash. The following example
     # finds all customers with +balance_amount+ equal to 20 and +balance_currency+ equal to "USD":
     #
-    #   Customer.where(balance: Money.new(20, "USD")).all
+    #   Customer.where(balance: Money.new(20, "USD"))
     #
     module ClassMethods
       # Adds reader and writer methods for manipulating a value object:

activerecord/lib/active_record/associations.rb

@@ -194,7 +194,7 @@ def association_instance_set(name, association)
     # * <tt>Project#project_manager, Project#project_manager=(project_manager), Project#project_manager.nil?,</tt>
     # * <tt>Project#milestones.empty?, Project#milestones.size, Project#milestones, Project#milestones<<(milestone),</tt>
     #   <tt>Project#milestones.delete(milestone), Project#milestones.destroy(mileston), Project#milestones.find(milestone_id),</tt>
-    #   <tt>Project#milestones.all(options), Project#milestones.build, Project#milestones.create</tt>
+    #   <tt>Project#milestones.build, Project#milestones.create</tt>
     # * <tt>Project#categories.empty?, Project#categories.size, Project#categories, Project#categories<<(category1),</tt>
     #   <tt>Project#categories.delete(category1), Project#categories.destroy(category1)</tt>
     #
@@ -743,7 +743,7 @@ def association_instance_set(name, association)
     # other than the main one. If this is the case Active Record falls back to the previously
     # used LEFT OUTER JOIN based strategy. For example
     #
-    #   Post.includes([:author, :comments]).where(['comments.approved = ?', true]).all
+    #   Post.includes([:author, :comments]).where(['comments.approved = ?', true])
     #
     # This will result in a single SQL query with joins along the lines of:
     # <tt>LEFT OUTER JOIN comments ON comments.post_id = posts.id</tt> and

activerecord/lib/active_record/locking/pessimistic.rb

@@ -26,7 +26,7 @@ module Locking
     #
     #   Account.transaction do
     #     # select * from accounts where ...
-    #     accounts = Account.where(...).all
+    #     accounts = Account.where(...)
     #     account1 = accounts.detect { |account| ... }
     #     account2 = accounts.detect { |account| ... }
     #     # select * from accounts where id=? for update