Few readability fixes

Author: abinashmeher999

spec/evalf_spec.rb

@@ -4,13 +4,15 @@
     it { is_expected.to be_a SymEngine::RealDouble }
     it { is_expected.to be_within(1e-15).of(0.909297426825682) }
   end
+
   if SymEngine::HAVE_MPFR
     context 'RealMPFR values' do
       subject { SymEngine.evalf(SymEngine::PI * SymEngine(1_963_319_607) - SymEngine(6_167_950_454), 100, true) }
       it { is_expected.to be_a SymEngine::RealMPFR }
       it { is_expected.to be_within(SymEngine::RealMPFR.new('1e-41', 100)).of(SymEngine::RealMPFR.new('1.4973429143989597928099399837265e-10', 100)) }
     end
   end
+
   context 'ComplexDouble values' do
     subject { SymEngine.evalf(SymEngine.sin(1) * SymEngine::I, 53, false) }
     it { is_expected.to be_a SymEngine::ComplexDouble }