Correct spelling mistakes (#342)

lib/arbre/context.rb

@@ -30,7 +30,7 @@ class Context < Element
     # Initialize a new Arbre::Context
     #
     # @param [Hash] assigns A hash of objecs that you would like to be
-    #                       availble as local variables within the Context
+    #                       available as local variables within the Context
     #
     # @param [Object] helpers An object that has methods on it which will become
     #                         instance methods within the context.
@@ -100,7 +100,7 @@ def with_current_arbre_element(tag)
 
 
     # Caches the rendered HTML so that we don't re-render just to
-    # get the content lenght or to delegate a method to the HTML
+    # get the content length or to delegate a method to the HTML
     def cached_html
       if defined?(@cached_html)
         @cached_html

spec/arbre/unit/element_finder_methods_spec.rb

@@ -24,7 +24,7 @@
       expect(elements[0]).to be_instance_of(Arbre::HTML::Li)
     end
 
-    it "should return multple child elements" do
+    it "should return multiple child elements" do
       html = arbre do
         ul
         li
@@ -78,7 +78,7 @@
       expect(elements[0]).to be_instance_of(Arbre::HTML::Div)
     end
 
-    it "should return multple child elements" do
+    it "should return multiple child elements" do
       html = arbre do
         div class: "some_class"
         div class: "my_class"

spec/arbre/unit/html/tag_spec.rb

@@ -99,7 +99,7 @@ def default_id_for_prefix
       expect(tag.class_names).to eq("hello_world")
     end
 
-    it "should seperate classes with space" do
+    it "should separate classes with space" do
       tag.add_class "hello world"
       expect(tag.class_list.size).to eq(2)
     end