Change field names from plural to singular so repeated fields will be singular on proto output.

PiperOrigin-RevId: 253227524
diff --git a/src/main/java/com/google/devtools/build/skydoc/rendering/FunctionUtil.java b/src/main/java/com/google/devtools/build/skydoc/rendering/FunctionUtil.java
index 2119b07..9ff337b 100644
--- a/src/main/java/com/google/devtools/build/skydoc/rendering/FunctionUtil.java
+++ b/src/main/java/com/google/devtools/build/skydoc/rendering/FunctionUtil.java
@@ -74,7 +74,7 @@
     return UserDefinedFunctionInfo.newBuilder()
         .setFunctionName(functionName)
         .setDocString(functionDescription)
-        .addAllParameters(paramsInfo)
+        .addAllParameter(paramsInfo)
         .build();
   }