linked the rcode function to the codegen docs
linked the rcode function to the codegen docs

madan96/sympy,kaushik94/sympy,jaimahajan1997/sympy,chaffra/sympy,chaffra/sympy,madan96/sympy,kaushik94/sympy,skidzo/sympy,chaffra/sympy,skidzo/sympy,kaushik94/sympy,skidzo/sympy,madan96/sympy,yashsharan/sympy,yashsharan/sympy,jaimahajan1997/sympy,jaimahajan1997/sympy,yashsharan/sympy