fix typos

Author: Freed-Wu

README_zh.md

@@ -513,7 +513,7 @@ target("test")
 add_requires("llvm 10.x", {alias = "llvm-10"})
 target("test")
     set_kind("binary")
-    add_files("src/*.c)
+    add_files("src/*.c")
     set_toolchains("llvm@llvm-10")
 ````
 
@@ -525,7 +525,7 @@ target("test")
 add_requires("muslcc")
 target("test")
     set_kind("binary")
-    add_files("src/*.c)
+    add_files("src/*.c")
     set_toolchains("@muslcc")
 ```