allow any non '}' in environment name for indent

Several non-alphabetic characters are allowed in environment names including numbers and '*', e.g. "equation*".

syntax/syntax.json

@@ -27,7 +27,7 @@
 		["$", "$"]
 	],
 	"indentationRules": {
-		"increaseIndentPattern": "\\\\begin{(?!document)([a-zA-Z]*)}(?!.*\\\\end{\\1})",
+		"increaseIndentPattern": "\\\\begin{(?!document)([^}]*)}(?!.*\\\\end{\\1})",
 		"decreaseIndentPattern": "^\\s*\\\\end{(?!document)"
 	},
 	"folding": {