Added the description for DiracDelta
Added the description for DiracDelta

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