Fix typo in RCP documentation am: da59f47a57

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3273254

Change-Id: Ia34b8bba04487bfc612e1c373cfa6c6b76a21fd9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/thread/docs/build-an-android-border-router.md b/thread/docs/build-an-android-border-router.md
index 63d89f7..f90a23b 100644
--- a/thread/docs/build-an-android-border-router.md
+++ b/thread/docs/build-an-android-border-router.md
@@ -169,7 +169,7 @@
     user thread_network
 ```
 
-For real RCP devices, it supports both SPI and UART interface and you can
+For real RCP devices, it supports both SPI and UART interfaces and you can
 specify the device with the schema `spinel+spi://`, `spinel+hdlc+uart://` and
 `spinel+socket://` respectively.