DEV: Correct typos and spelling mistakes (#12812)

Over the years we accrued many spelling mistakes in the code base. 

This PR attempts to fix spelling mistakes and typos in all areas of the code that are extremely safe to change 

- comments
- test descriptions
- other low risk areas

spec/lib/bookmark_manager_spec.rb

@@ -109,7 +109,7 @@ RSpec.describe BookmarkManager do
       end
     end
 
-    context "when the post is inaccessable for the user" do
+    context "when the post is inaccessible for the user" do
       before do
         post.trash!
       end
@@ -118,7 +118,7 @@ RSpec.describe BookmarkManager do
       end
     end
 
-    context "when the topic is inaccessable for the user" do
+    context "when the topic is inaccessible for the user" do
       before do
         post.topic.update(category: Fabricate(:private_category, group: Fabricate(:group)))
       end
@@ -182,7 +182,7 @@ RSpec.describe BookmarkManager do
       )
     end
 
-    it "saves the time and new reminder type and new name sucessfully" do
+    it "saves the time and new reminder type and new name successfully" do
       update_bookmark
       bookmark.reload
       expect(bookmark.name).to eq(new_name)