docs: fix hmr typos

`hrm` -> `hmr`

Author: kulshekhar

docs/documentation/stories/configure-hmr.md

@@ -3,7 +3,7 @@
 Hot Module Replacement (HMR) is a WebPack feature to update code in a running app without rebuilding it.
 This results in faster updates and less full page-reloads.
 
-You can read more about HRM by visiting [this page](https://webpack.github.io/docs/hot-module-replacement.html).
+You can read more about HMR by visiting [this page](https://webpack.github.io/docs/hot-module-replacement.html).
 
 In order to get HMR working with Angular CLI we first need to add a new environment and enable it.
 
@@ -22,7 +22,7 @@ export const environment = {
 };
 ```
 
-Update `src/environments/environment.prod.ts` and add the `hrm: false` flag to the environment:
+Update `src/environments/environment.prod.ts` and add the `hmr: false` flag to the environment:
 
 ```typescript
 export const environment = {
@@ -31,7 +31,7 @@ export const environment = {
 };
 ```
 
-Update `src/environments/environment.ts` and add the `hrm: false` flag to the environment:
+Update `src/environments/environment.ts` and add the `hmr: false` flag to the environment:
 
 ```typescript
 export const environment = {