Fix typos throughout the codebase

spec/ameba/rule/lint/empty_expression_spec.cr

@@ -95,7 +95,7 @@ module Ameba
       end
     )
 
-    it "does not report emtpy expression in macro" do
+    it "does not report empty expression in macro" do
       s = Source.new %q(
         module MyModule
           macro conditional_error_for_inline_callbacks

spec/ameba/rule/lint/shadowing_local_outer_var_spec.cr

@@ -201,7 +201,7 @@ module Ameba::Rule::Lint
         subject.catch(source).should be_valid
       end
 
-      it "does not report shadowed vars in macro withing the same scope" do
+      it "does not report shadowed vars in macro within the same scope" do
         source = Source.new %(
           {% methods = klass.methods.select { |m| m.annotation(MyAnn) } %}
 
@@ -214,7 +214,7 @@ module Ameba::Rule::Lint
         subject.catch(source).should be_valid
       end
 
-      it "does not report shadowed vars withing nested macro" do
+      it "does not report shadowed vars within nested macro" do
         source = Source.new %(
           module Foo
             macro included

src/ameba/ast/variabling/variable.cr

@@ -154,7 +154,7 @@ module Ameba::AST
         node.location == @node.location
     end
 
-    # Returns true if the variable is delcared before the `node`.
+    # Returns true if the variable is declared before the `node`.
     def declared_before?(node)
       var_location, node_location = location, node.location
 

src/ameba/rule/lint/spec_focus.cr

@@ -4,7 +4,7 @@ module Ameba::Rule::Lint
   # In specs `focus: true` is mainly used to focus on a spec
   # item locally during development. However, if such change
   # is committed, it silently runs only focused spec on all
-  # other enviroment, which is undesired.
+  # other environment, which is undesired.
   #
   # This is considered bad:
   #