Support JSDoc comment optional values with negative exponents (#5596)

* Fix src/mode/jsdoc_comment_highlight_rules.js to support JSDoc comment optional values with negative exponents like: `@param {number} [min_value=1e-5]`

* Support strings and spaces aswell

src/mode/jsdoc_comment_highlight_rules.js

@@ -24,7 +24,7 @@ var JsDocCommentHighlightRules = function() {
                         ]
                     }, {
                         token: ["rparen.doc", "text.doc", "variable.parameter.doc", "lparen.doc", "variable.parameter.doc", "rparen.doc"],
-                        regex: /(})(\s*)(?:([\w=:\/\.]+)|(?:(\[)([\w=:\/\.]+)(\])))/,
+                        regex: /(})(\s*)(?:([\w=:\/\.]+)|(?:(\[)([\w=:\/\.\-\'\" ]+)(\])))/,
                         next: "pop"
                     }, {
                         token: "rparen.doc",