[PR][php-langspec][#37][master][closed] - Small grammar fix

You can view the Pull Request on github: https://github.com/php/php-langspec/pull/37 Pull Request Description: Adding "that" to the following section: ####Value Assignment of Scalar Types to a Local Variable Value assignment is the primary means by which the programmer can create local variables. If a local variable **that** appears on the left-hand side of value assignment does not exist, the engine will bring a new local variable into existence and create a VSlot and initial VStore for storing the local variable's value.