Update tests.

docs/abi-spec.rst

@@ -529,7 +529,7 @@ As an example, the code
     pragma experimental ABIEncoderV2;
 
 
-    contract Test {
+    abstract contract Test {
         struct S { uint a; uint[] b; T[] c; }
         struct T { uint x; uint y; }
         function f(S memory s, T memory t, uint a) public;

docs/contracts/abstract-contracts.rst

@@ -14,7 +14,7 @@ provided (no implementation body ``{ }`` was given).::
 
     pragma solidity >=0.4.0 <0.7.0;
 
-    contract Feline {
+    abstract contract Feline {
         function utterance() public returns (bytes32);
     }
 
@@ -23,7 +23,7 @@ all defined functions. The usage of an abstract contract as a base class is show
 
     pragma solidity >=0.4.0 <0.7.0;
 
-    contract Feline {
+    abstract contract Feline {
         function utterance() public returns (bytes32);
     }
 

docs/contracts/inheritance.rst

@@ -52,12 +52,12 @@ Details are given in the following example.
     // interface known to the compiler. Note the function
     // without body. If a contract does not implement all
     // functions it can only be used as an interface.
-    contract Config {
+    abstract contract Config {
         function lookup(uint id) public returns (address adr);
     }
 
 
-    contract NameReg {
+    abstract contract NameReg {
         function register(bytes32 name) public;
         function unregister() public;
     }

docs/style-guide.rst

@@ -91,7 +91,7 @@ Yes::
 
     pragma solidity >=0.4.0 <0.7.0;
 
-    contract A {
+    abstract contract A {
         function spam() public pure;
         function ham() public pure;
     }