docs: update uni-id-pages.md

docs/uniCloud/uni-id-pages.md

@@ -2176,10 +2176,10 @@ class Sign {
 
 	getParamsString (params) {
 		return Object.keys(params)
-						.sort()
-						.filter(item => typeof params[item] !== "object")
-						.map(item => `${item}=${params[item]}`)
-						.join('&')
+			.sort()
+			.filter(item => typeof params[item] !== "object")
+			.map(item => `${item}=${params[item]}`)
+			.join('&')
 	}
 }