removed duplicate 'sdx, sdy, sdz' output from 'Table of Symbols'
removed duplicate 'sdx, sdy, sdz' output from 'Table of Symbols'

JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software