Clean up add-on-registry.md docs (#6456)

packages/registry/docs/conceptual-guides/add-on-registry.md

@@ -19,20 +19,20 @@ The add-on registry can be queried, so it can provide a list of add-ons installe
 ## What is an add-on?
 
 Add-on packages are just CommonJS or ESM packages.
-Their main purpose is to encapsulate logic, configuration and customizations in a reusable way.
-The only requirement is that their primary entry point (the `main` key of their `package.json`) points to a module that exports a default function, which acts as a default configuration loader for that package.
+Their main purpose is to encapsulate logic, configuration, and customizations in a reusable way.
+The only requirement is that their primary entry point (the `main` key of their {file}`package.json`) points to a module that exports a default function, which acts as a default configuration loader for that package.
 
-Add-ons are applied in the order they are declared in the `addons` key of {file}`package.json` or programatically via a provided configuration file.
+Add-ons are applied in the order they are declared in the `addons` key of {file}`package.json` or programmatically via a provided configuration file.
 Add-ons can override configuration coming from other add-ons, providing a hierarchy of configuration stacks.
 
 An add-on can be published in an npm registry, just as any other package.
-However, add-ons are meant to not be transpiled, but built along with your app code.
+However, add-ons are meant not to be transpiled, but built along with your app code.
 They can be released as "source" packages or used directly in your app as local code.
 
-Add-ons can define shadowed components.
-"Component shadowing" is a technique for overriding modules of other packages at build time.
-This technique builds upon the `resolve.aliases` facilities of bundlers, so modules can be replaced when the app is being built.
-
 Add-ons can be chained, where each one can configure the app in some way.
 If needed, each add-on in the chain can override or extend the previous configuration that other add-ons set.
 Thus, the order in which you register add-ons matters.
+
+Add-ons can define shadowed components.
+"Component shadowing" is a technique for overriding modules of other packages at build time.
+This technique builds upon the `resolve.aliases` facilities of bundlers, so modules can be replaced when the app is being built.