Change error messaging of @SkylarkCallable invocations to match @SkylarkSignature more closely.

Also clarify the method representation in these error messages is for the attempted method *call*, not the actual method signature.

RELNOTES: None.
PiperOrigin-RevId: 189935148

src/main/java/com/google/devtools/build/lib/syntax/FuncallExpression.java

diff --git a/src/main/java/com/google/devtools/build/lib/syntax/FuncallExpression.java b/src/main/java/com/google/devtools/build/lib/syntax/FuncallExpression.java
index 841a94a..566c9fe 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/FuncallExpression.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/FuncallExpression.java
@@ -440,7 +440,7 @@
       } else {
         errorMessage =
             String.format(
-                "%s, in method %s of '%s'",
+                "%s, in method call %s of '%s'",
                 argumentListConversionResult.getError(),
                 formatMethod(methodName, args, kwargs),
                 EvalUtils.getDataTypeNameFromClass(objClass));
@@ -538,7 +538,8 @@
         } else if (!type.contains(value)) {
           return ArgumentListConversionResult.fromError(
               String.format(
-                  "Cannot convert parameter '%s' to type %s", param.name(), type.toString()));
+                  "expected value of type '%s' for parameter '%s'",
+                  type.toString(), param.name()));
         }
         i++;
       } else if (param.named() && keys.remove(param.name())) {
@@ -547,7 +548,8 @@
         if (!type.contains(value)) {
           return ArgumentListConversionResult.fromError(
               String.format(
-                  "Cannot convert parameter '%s' to type %s", param.name(), type.toString()));
+                  "expected value of type '%s' for parameter '%s'",
+                  type.toString(), param.name()));
         }
       } else {
         // Use default value