Small fixes for Context Menu tutorial (#1051)

FEATURES.md

@@ -18,6 +18,7 @@
    * [Keyboard navigation](tutorials/Tab_Navigation/README.md)
    * [Tray, menu bar and notifications](tutorials/Tray_Notifications_MenuBar_new/README.md)
    * [Window properties handling](tutorials/Window_API_new/README.md)
+   * [Context Menu](tutorials/Context_Menu/README.md)  
 
 ### Features currently available in Compose for Web
    * [Intro](tutorials/Web/Building_UI/README.md)
@@ -42,4 +43,4 @@ Following limitations apply to Alpha release.
 * M1 works only with Gradle 6.4 and 6.5;
 * M2 works only with Gradle 6.4 or later (6.7 is the latest tested version).
 * M3 works only with Gradle 6.4 or later (6.8 is the latest tested version).
-* Alpha works with Gralde 6.7 or later (7.1 is the latest tested version).
+* Alpha works with Gradle 6.7 or later (7.1 is the latest tested version).

tutorials/Context_Menu/README.md

@@ -75,8 +75,8 @@ fun main() = singleWindowApplication(title = "Context menu") {
 ```
 In this example Text/TextField context menus will be extended with two additional items. 
 
-## Context menu for arbitary area
-There is possibility to create a context menu for arbitary application window area. This is implemented using ContextMenuArea API that is 
+## Context menu for an arbitary area
+There is a possibility to create a context menu for an arbitary application window area. This is implemented using ContextMenuArea API that is 
 similar to ContextMenuDataProvider. 
 ```kotlin
 @OptIn(ExperimentalComposeUiApi::class, androidx.compose.foundation.ExperimentalFoundationApi::class)
@@ -94,4 +94,4 @@ fun main() = singleWindowApplication(title = "Context menu") {
    }
 } 
 ```
-Right click on the Blue Square will show context menu with two items
+Right click on the Blue Square will show a context menu with two items