Update docs/contributing/coding-style.md

Co-authored-by: Kiichiro YUKAWA <kyukawa315@gmail.com>
vdaas · Nov 10, 2020 · 43f3d6d · 43f3d6d
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diff --git a/docs/contributing/coding-style.md b/docs/contributing/coding-style.md
@@ -967,7 +967,7 @@ We do not suggest to modify the generated code other than the `tests` variable,
     ```
 ### Using Mock
 
-In Vald, we use a lot of external library, there are a lot of dependencies between libraries.
+In Vald, we use a lot of external libraries, there are a lot of dependencies between libraries.
 
 As a result, due to the more complexity of the test, it has become more difficult to determine whether or not to mock dependencies.