runtime(doc): grammar fixes in doc (#13164)

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/ft_rust.txt b/runtime/doc/ft_rust.txt
index 9d5eb8c..fb8141c 100644
--- a/runtime/doc/ft_rust.txt
+++ b/runtime/doc/ft_rust.txt
@@ -474,8 +474,8 @@
 		register.
 
 :RustInfoToFile [filename]                                   *:RustInfoToFile*
-		Saves debugging info of the Vim Rust plugin to the the given
-		file, overwritting it.
+		Saves debugging info of the Vim Rust plugin to the given file,
+		overwriting it.
 
 ==============================================================================
 MAPPINGS                                                       *rust-mappings*