docs: update control-flow.md to replace else-if with else if

fix incorrect hyphenated form "else-if" and update documentation to match correct syntax "else if"

Author: cmgchess

adev/src/content/guide/templates/control-flow.md

@@ -2,7 +2,7 @@
 
 Angular templates support control flow blocks that let you conditionally show, hide, and repeat elements.
 
-## Conditionally display content with `@if`, `@else-if` and `@else`
+## Conditionally display content with `@if`, `@else if` and `@else`
 
 The `@if` block conditionally displays its content when its condition expression is truthy: