Scheme: Improved boolean (#2316)

I noticed that scheme booleans also partially highlighted `#true`, so I fixed that.

Author: RunDevelopment

components/prism-scheme.js

@@ -44,7 +44,7 @@ Prism.languages.scheme = {
 pattern: /([\s()])(?:(?:#d(?:#[ei])?|#[ei](?:#d)?)?[+-]?(?:(?:\d*\.?\d+(?:[eE][+-]?\d+)?|\d+\/\d+)(?:[+-](?:\d*\.?\d+(?:[eE][+-]?\d+)?|\d+\/\d+)i)?|(?:\d*\.?\d+(?:[eE][+-]?\d+)?|\d+\/\d+)i)|(?:#[box](?:#[ei])?|#[ei](?:#[box])?)[+-]?(?:[\da-fA-F]+(?:\/[\da-fA-F]+)?(?:[+-][\da-fA-F]+(?:\/[\da-fA-F]+)?i)?|[\da-fA-F]+(?:\/[\da-fA-F]+)?i))(?=[\s()]|$)/,
 lookbehind: true
 },
-'boolean': /#[tf]/,
+'boolean': /#[ft](?=[()\s]|$)/,
 'operator': {
 pattern: /(\()(?:[-+*%\/]|[<>]=?|=>?)(?=\s|$)/,
 lookbehind: true

components/prism-scheme.min.js

@@ -1,13 +1,19 @@
 #t
 #f
 
+; not a boolean
+#true
+
 ----------------------------------------------------
 
 [
 ["boolean", "#t"],
-["boolean", "#f"]
+["boolean", "#f"],
+
+["comment", "; not a boolean"],
+"\r\n#true"
 ]
 
 ----------------------------------------------------
 
-Checks for booleans.
+Checks for booleans.