Added the contextual example for DiracDelta(x, k).
Added the contextual example for DiracDelta(x, k).

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