Fix ShouldThrow syntax errors in specs

Author: YarekTyshchenko

src/Polly.Specs/RateLimit/RateLimitPolicySpecsBase.cs

@@ -57,47 +57,47 @@ public void Syntax_should_throw_for_perTimeSpan_zero()
         {
             Action invalidSyntax = () => GetPolicyViaSyntax(1, TimeSpan.Zero);
 
-            invalidSyntax.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("perTimeSpan");
+            invalidSyntax.Should().Throw<ArgumentOutOfRangeException>().And.ParamName.Should().Be("perTimeSpan");
         }
 
         [Fact]
         public void Syntax_should_throw_for_numberOfExecutions_negative()
         {
             Action invalidSyntax = () => GetPolicyViaSyntax(-1, TimeSpan.FromSeconds(1));
 
-            invalidSyntax.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("numberOfExecutions");
+            invalidSyntax.Should().Throw<ArgumentOutOfRangeException>().And.ParamName.Should().Be("numberOfExecutions");
         }
 
         [Fact]
         public void Syntax_should_throw_for_numberOfExecutions_zero()
         {
             Action invalidSyntax = () => GetPolicyViaSyntax(0, TimeSpan.FromSeconds(1));
 
-            invalidSyntax.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("numberOfExecutions");
+            invalidSyntax.Should().Throw<ArgumentOutOfRangeException>().And.ParamName.Should().Be("numberOfExecutions");
         }
 
         [Fact]
         public void Syntax_should_throw_for_perTimeSpan_negative()
         {
             Action invalidSyntax = () => GetPolicyViaSyntax(1, TimeSpan.FromTicks(-1));
 
-            invalidSyntax.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("perTimeSpan");
+            invalidSyntax.Should().Throw<ArgumentOutOfRangeException>().And.ParamName.Should().Be("perTimeSpan");
         }
 
         [Fact]
         public void Syntax_should_throw_for_maxBurst_negative()
         {
             Action invalidSyntax = () => GetPolicyViaSyntax(1, TimeSpan.FromSeconds(1), -1);
 
-            invalidSyntax.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("maxBurst");
+            invalidSyntax.Should().Throw<ArgumentOutOfRangeException>().And.ParamName.Should().Be("maxBurst");
         }
 
         [Fact]
         public void Syntax_should_throw_for_maxBurst_zero()
         {
             Action invalidSyntax = () => GetPolicyViaSyntax(1, TimeSpan.FromSeconds(1), 0);
 
-            invalidSyntax.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("maxBurst");
+            invalidSyntax.Should().Throw<ArgumentOutOfRangeException>().And.ParamName.Should().Be("maxBurst");
         }
 
         [Theory]