Correct few spelling in the comments

app/controllers/topics_controller.rb

@@ -120,7 +120,7 @@ class TopicsController < ApplicationController
     title, raw = params[:title], params[:raw]
     [:title, :raw].each { |key| check_length_of(key, params[key]) }
 
-    # Only suggest similar topics if the site has a minimmum amount of topics present.
+    # Only suggest similar topics if the site has a minimum amount of topics present.
     topics = Topic.similar_to(title, raw, current_user).to_a if Topic.count_exceeds_minimum?
 
     render_serialized(topics, BasicTopicSerializer)

app/jobs/regular/pull_hotlinked_images.rb

@@ -40,7 +40,7 @@ module Jobs
                 puts "Failed to pull hotlinked image: #{src} - Image is bigger than #{@max_size}"
               end
             end
-            # have we successfuly downloaded that file?
+            # have we successfully downloaded that file?
             if downloaded_urls[src].present?
               url = downloaded_urls[src]
               escaped_src = src.gsub("?", "\\?").gsub(".", "\\.").gsub("+", "\\+")

app/models/hot_topic.rb

@@ -3,7 +3,7 @@ class HotTopic < ActiveRecord::Base
   belongs_to :topic
   belongs_to :category
 
-  # Here's the current idea behind the implementaiton of hot: random can produce good results!
+  # Here's the current idea behind the implementation of hot: random can produce good results!
   # Hot is currently made up of a random selection of high percentile topics. It includes mostly
   # new topics, but also some old ones for variety.
   def self.refresh!

app/models/topic_user.rb

@@ -138,7 +138,7 @@ class TopicUser < ActiveRecord::Base
 
       # In case anyone seens "seen_post_count" and gets confused, like I do.
       # seen_post_count represents the highest_post_number of the topic when
-      # the user visited it. It may be out of alignement with last_read, meaning
+      # the user visited it. It may be out of alignment with last_read, meaning
       # ... user visited the topic but did not read the posts
       rows = exec_sql("UPDATE topic_users
                                     SET

app/models/user.rb

@@ -554,7 +554,7 @@ class User < ActiveRecord::Base
   end
 
   def add_trust_level
-    # there is a possiblity we did not load trust level column, skip it
+    # there is a possibility we did not load trust level column, skip it
     return unless has_attribute? :trust_level
     self.trust_level ||= SiteSetting.default_trust_level
   end