docs: remove =true from --next

`=true` us redundant

(cherry picked from commit 5f930c9)

Author: alan-agius4

packages/angular/cli/commands/update-long.md

@@ -4,14 +4,19 @@ Perform a basic update to the current stable release of the core framework and C
 ng update @angular/cli @angular/core
 ```
 
-To update to the next beta or pre-release version, use the `--next=true` option.
+To update to the next beta or pre-release version, use the `--next` option.
 
 To update from one major version to another, use the format
-`ng update @angular/cli@^<major_version> @angular/core@^<major_version>`.
+
+```
+ng update @angular/cli@^<major_version> @angular/core@^<major_version>
+```
 
 We recommend that you always update to the latest patch version, as it contains fixes we released since the initial major release.
-For example, use the following command to take the latest 9.x.x version and use that to update.
+For example, use the following command to take the latest 10.x.x version and use that to update.
 
-`ng update @angular/cli@^9 @angular/core@^9`
+```
+ng update @angular/cli@^10 @angular/core@^10
+```
 
 For detailed information and guidance on updating your application, see the interactive [Angular Update Guide](https://update.angular.io/).