Misc javadoc

Author: mrotteveel

src/main/java/org/firebirdsql/testcontainers/FirebirdContainer.java

@@ -12,7 +12,7 @@
 /**
  * Testcontainers implementation for Firebird.
  * <p>
- * Supported image: {@code firebirdsql/firebird} and {@code jacobalberty/firebird} (deprecated).
+ * Supported images: {@code firebirdsql/firebird} and {@code jacobalberty/firebird} (deprecated).
  * <p>
  * Exposed ports: 3050
  */