Correct the specs for Session#body, #html, #source.
Correct the specs for Session#body, #html, #source.

Per f4360f60998ea4805dfba89a1613939d054975c4, #body should return the
unmodified source, just like #source. However, in Selenium it doesn't,
which is why this test was passing, even though it is incorrect.

I have corrected the spec for #body to match #source (as it is just an
alias), and changed the original spec for #body to be the spec for #html.

shepmaster/capybara,Bartuz/capybara,DariaKalynovska/capybara,olivierlacan/capybara,teamcapybara/capybara,sideci-sample/sideci-sample-capybara,ngpestelos/capybara,pombredanne/capybara,mohanraj1311/capybara,DariaKalynovska/capybara,mlarraz/capybara,irfanah/capybara,tjouan/capybara,y-yagi/capybara,jnicklas/capybara,tjouan/capybara,randoum/capybara,shepmaster/capybara,twalpole/capybara,jillianrosile/capybara,shepmaster/capybara,mreinsch/capybara,ducthanh/capybara,randoum/capybara,teamcapybara/capybara,jnicklas/capybara,y-yagi/capybara,ngpestelos/capybara,twalpole/capybara,khaidpham/capybara,tjgrathwell/capybara,ducthanh/capybara,jillianrosile/capybara,jillianrosile/capybara,pombredanne/capybara,soutaro/capybara,tjgrathwell/capybara,soutaro/capybara,Bartuz/capybara,randoum/capybara,y-yagi/capybara,irfanah/capybara,ksmaheshkumar/capybara,ngpestelos/capybara,teamcapybara/capybara,irfanah/capybara,benlovell/capybara,Bartuz/capybara,gonzedge/capybara,jarib/capybara,twalpole/capybara,ksmaheshkumar/capybara,sideci-sample/sideci-sample-capybara,ducthanh/capybara,tjgrathwell/capybara,tjouan/capybara,soutaro/capybara,mohanraj1311/capybara,jarib/capybara,DariaKalynovska/capybara,mlarraz/capybara,pombredanne/capybara,ksmaheshkumar/capybara,jnicklas/capybara,khaidpham/capybara,mlarraz/capybara,mohanraj1311/capybara,wenbofantasy/capybara,wenbofantasy/capybara,benlovell/capybara,olivierlacan/capybara,olivierlacan/capybara,khaidpham/capybara,gonzedge/capybara,mreinsch/capybara,gonzedge/capybara