typo 'main.cs' -> 'main.css', and textile typo 'h6(:has_many-group)' ->...

typo 'main.cs' -> 'main.css', and textile typo 'h6(:has_many-group)' -> 'h6(#has_many-group)', and typo. missing 'if'

railties/guides/source/active_record_querying.textile

@@ -802,7 +802,7 @@ will either assign an existing client object with the name "Ryan" to the client
 
 h3. Finding by SQL
 
-If you'd like to use your own SQL to find records in a table you can use +find_by_sql+. The +find_by_sql+ method will return an array of objects even the underlying query returns just a single record. For example you could run this query:
+If you'd like to use your own SQL to find records in a table you can use +find_by_sql+. The +find_by_sql+ method will return an array of objects even if the underlying query returns just a single record. For example you could run this query:
 
 <ruby>
 Client.find_by_sql("SELECT * FROM clients 

railties/guides/source/association_basics.textile

@@ -1262,7 +1262,7 @@ end
 
 TIP: In any case, Rails will not create foreign key columns for you. You need to explicitly define them as part of your migrations.
 
-h6(:has_many-group). +:group+
+h6(#has_many-group). +:group+
 
 The +:group+ option supplies an attribute name to group the result set by, using a +GROUP BY+ clause in the finder SQL.
 

railties/guides/source/layouts_and_rendering.textile

@@ -747,7 +747,7 @@ You can even use dynamic paths such as +cache/#{current_site}/main/display+.
 
 h5. Linking to CSS Files with +stylesheet_link_tag+
 
-The +stylesheet_link_tag+ helper returns an HTML +<link>+ tag for each source provided. Rails looks in +public/stylesheets+ for these files by default, but you can specify a full path relative to the document root, or a URL, if you prefer. For example, to include +public/stylesheets/main.cs+:
+The +stylesheet_link_tag+ helper returns an HTML +<link>+ tag for each source provided. Rails looks in +public/stylesheets+ for these files by default, but you can specify a full path relative to the document root, or a URL, if you prefer. For example, to include +public/stylesheets/main.css+:
 
 <erb>
 <%= stylesheet_link_tag "main" %>