Polys: Improved the docstrings of LM(), LT() and revert()(#11427)
Polys: Improved the docstrings of LM(), LT() and revert()(#11427)

Added more description about the method in LM(), LT() and gave the examples for revert(f, n) to clear about its functionality in docstrings. These changes have been made in the polytools.py file in polys.

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