Update modernizing-existing-add-ons.md

Author: matthewjohns0n

docs/development/modernizing-existing-add-ons.md

@@ -11,21 +11,21 @@
 
 
 
-The ExpressionEngine 7.2 release brough a new add-on developemnt approach, which generates the majority of the add-ons needed files and struture.  It also bring additional organization to how add-ons are developed.
+The ExpressionEngine 7.2 release brought a new add-on development approach, which generates the majority of the add-on's needed files and structure. It also brings additional organization to how add-ons are developed.
 
 NOTE: These changes do NOT break existing add-ons.  The old development methodologies will still work.
 
-The idea of a plugin, module, extension, fieldtype, etc. no longer exist.  Instead an add-on can have a template tag, or a field-type, or an extention.
+The idea of a plugin, module, extension, fieldtype, etc. no longer exists. Instead, an add-on can have a template tag, a fieldtype, or an extension.
 
-In order to harness the new add-on development methodology, you will have to do a few SMALL updates to your existing add-on's.
+In order to harness the new add-on development methodology, you will have to do a few SMALL updates to your existing add-ons.
 
-TIP: You don't have to migrate your add-on to the new development methodology.  After making the following changes, you can leave your add-ons as is, and start new / additional development in the new method.
+TIP: You don't have to migrate your add-on to the new development methodology.  After making the following changes, you can leave your add-ons as is, and start new/additional development in the new method.
 
 
 [TOC]
 
 ## Updating your mod.addon.php file
-In order to use the new approach, you will have to have your mod file use and extend the module addon service
+In order to use the new approach, you will have to have your mod file use and extend the module add-on service
 
 
 ```
@@ -37,7 +37,7 @@ class Addon extends Module
 
 ## Updating your mcp.addon.php file
 
-In order to use the new approach, you will have to have your mcp file use and extend the Mcp addon service
+In order to use the new approach, you will have to have your mcp file use and extend the Mcp add-on service
 
 ```
 use ExpressionEngine\Service\Addon\Mcp;
@@ -47,7 +47,7 @@ class Addon_mcp extends Mcp
 
 ## Updating your ext.addon.php file
 
-In order to use the new approach, you will have to have your mcp file use and extend the Extension addon service
+In order to use the new approach, you will have to have your mcp file use and extend the Extension add-on service
 
 ```
 use ExpressionEngine\Service\Addon\Extension;
@@ -57,12 +57,12 @@ class Addon_ext extends Extension
 
 ## Updating your upd.addon.php file
 
-In order to use the new approach, you will have to have your mcp file use and extend the Instaler addon service
+In order to use the new approach, you will have to have your mcp file use and extend the Installer add-on service
 
 ```
 use ExpressionEngine\Service\Addon\Installer;
 
 class Addon_upd extends Installer
 ```
 ## A Note on Plugins
-If your add-on is currently a plugin and your looking to take advantage of the new add-on development methodologies, we recommend migrating your plugin methods (functions) to your mod file first.  This can be done with a simple copy and paste.
+If your add-on is currently a plugin and you are looking to take advantage of the new add-on development methodologies, we recommend migrating your plugin methods (functions) to your mod file first.  This can be done with a simple copy and paste.