some docs updates
some docs updates

madan96/sympy,hargup/sympy,hargup/sympy,yashsharan/sympy,ChristinaZografou/sympy,postvakje/sympy,drufat/sympy,jaimahajan1997/sympy,skidzo/sympy,sampadsaha5/sympy,kaushik94/sympy,aktech/sympy,chaffra/sympy,postvakje/sympy,kaushik94/sympy,skidzo/sympy,rahuldan/sympy,jaimahajan1997/sympy,sampadsaha5/sympy,souravsingh/sympy,sampadsaha5/sympy,chaffra/sympy,kaushik94/sympy,ChristinaZografou/sympy,souravsingh/sympy,jaimahajan1997/sympy,madan96/sympy,rahuldan/sympy,drufat/sympy,aktech/sympy,aktech/sympy,yashsharan/sympy,chaffra/sympy,drufat/sympy,ChristinaZografou/sympy,postvakje/sympy,madan96/sympy,hargup/sympy,yashsharan/sympy,rahuldan/sympy,souravsingh/sympy,skidzo/sympy