Clean up GRAMMAR documentation syntax (#37)

* Create GRAMMAR

* Copy in all grammar documentation.
Documentation can be easily parsed out to generate html.
list-filter-expr was fixed from what was posted on the website
numerous typos were also corrected
smart quotes were converted to their ascii counterparts

* Clean up GRAMMAR documentation syntax

Author: innovate-invent

GRAMMAR

@@ -85,7 +85,7 @@ sub-expression    = expression "." ( identifier / multi-select-list / multi-sele
 ;; search(foo.bar.baz, {"foo": {"bar": {"baz": "value"}}}) -> "value"
 ;; ```
 
-pipe-expression   = expression "|" expression ;; # Pipe Expressions \
+pipe-expression   = expression "|" expression ;; # Pipe Expressions
 ;; A pipe expression combines two expressions, separated by the `|` character. It is similar to a sub-expression with two
 ;; important distinctions:
 ;;
@@ -384,8 +384,7 @@ bracket-specifier =  "[" "*" "]"
 
 list-filter-expr = "[?" expression "]" ;; # Filter Expressions \
 comparator-expression = expression comparator expression ;; \
-comparator        = "<" / "<=" / "==" / ">=" / ">" / "!=" ;; \
-
+comparator        = "<" / "<=" / "==" / ">=" / ">" / "!="
 ;; A filter expression provides a way to select JSON elements based on a comparison to another expression. A filter
 ;; expression is evaluated as follows: for each element in an array evaluate the expression against the element. If the
 ;; expression evaluates to a truth-like value, the item (in its entirety) is added to the result list. Otherwise it is
@@ -440,7 +439,6 @@ comparator        = "<" / "<=" / "==" / ">=" / ">" / "!=" ;; \
 ;; search(foo[?a==b], {"foo": [{"a": 1, "b": 2}, {"a": 2, "b": 2}]}) -> [{"a": 2, "b": 2}]
 ;; ```
 
-
 function-expression = unquoted-string  ( no-args  / one-or-more-args ) ;; # Functions Expressions \
 no-args             = "(" ")" ;; \
 one-or-more-args    = "(" ( function-arg *( "," function-arg ) ) ")" ;; \