Fix error in operator table (LDot/Dot)

[filonik]

The table in README.md incorrectly lists x<<y as Dot, when it should really be left contraction (LDot).

I have corrected the mistake, and added a separate row for the symmetric contraction (Dot).

See:

ganja.js/ganja.js

Line 1786 in 910e574

var syntax = (intxt instanceof Function)?[[['.Normalized','Normalize',2],['.Length','Length',2]],[['~','Conjugate',1],['!','Dual',1]],[['**','Pow',0,1]],[['^','Wedge'],['&','Vee'],['<<','LDot']],[['*','Mul'],['/','Div']],[['|','Dot']],[['>>>','sw',0,1]],[['-','Sub'],['+','Add']],[['%','%']],[['==','eq'],['!=','neq'],['<','lt'],['>','gt'],['<=','lte'],['>=','gte']]]

[filonik]

Here's a related pull request that addresses this for coffeeshop help: #110