Fix typos in `android.fileGroupProperties`'s documentation.

Change-Id: Ife16066d8015cc98b6a86f7405fe478e13f554cb
Test: n/a (comment-only change)
diff --git a/android/filegroup.go b/android/filegroup.go
index 4daff8f..47102b9 100644
--- a/android/filegroup.go
+++ b/android/filegroup.go
@@ -41,11 +41,11 @@
 
 	Exclude_srcs proptools.Configurable[[]string] `android:"path"`
 
-	// Sources the will be included in the filegroup, but any module dependencies will be added
+	// Sources that will be included in the filegroup, but any module dependencies will be added
 	// using the device os and the device's first architecture's variant.
 	Device_first_srcs proptools.Configurable[[]string] `android:"path_device_first"`
 
-	// Sources the will be included in the filegroup, but any module dependencies will be added
+	// Sources that will be included in the filegroup, but any module dependencies will be added
 	// using the device os and the common architecture's variant.
 	Device_common_srcs proptools.Configurable[[]string] `android:"path_device_common"`