Fix fine grained tests

Fix error messages in fine grained tests

Author: pranavrajpal

test-data/unit/fine-grained.test

@@ -4165,9 +4165,9 @@ y = 0
 [file a.py.2]
 y = ''
 [out]
-main:4: error: Need type annotation for "x"
+main:4: error: Need type annotation for "x" (hint: "x: Optional[<type>] = ...")
 ==
-main:4: error: Need type annotation for "x"
+main:4: error: Need type annotation for "x" (hint: "x: Optional[<type>] = ...")
 
 [case testNonePartialType2]
 import a
@@ -4183,9 +4183,9 @@ y = 0
 [file a.py.2]
 y = ''
 [out]
-main:4: error: Need type annotation for "x"
+main:4: error: Need type annotation for "x" (hint: "x: Optional[<type>] = ...")
 ==
-main:4: error: Need type annotation for "x"
+main:4: error: Need type annotation for "x" (hint: "x: Optional[<type>] = ...")
 
 [case testNonePartialType3]
 import a
@@ -4197,7 +4197,7 @@ def f() -> None:
     y = ''
 [out]
 ==
-a.py:1: error: Need type annotation for "y"
+a.py:1: error: Need type annotation for "y" (hint: "y: Optional[<type>] = ...")
 
 [case testNonePartialType4]
 import a
@@ -4213,7 +4213,7 @@ def f() -> None:
     global y
     y = ''
 [out]
-a.py:1: error: Need type annotation for "y"
+a.py:1: error: Need type annotation for "y" (hint: "y: Optional[<type>] = ...")
 ==
 
 [case testSkippedClass1]