[INTERNAL] lib/processors/jsdoc: allow single character property names

The regex used to check for valid property names mistakenly required at
least two characters in an identifier-like property name.

Cherry-picked from UI5/openui5@ead6e7fd6 which was a follow-up to UI5/openui5/9b2a1914b

Author: codeworrior

lib/processors/jsdoc/lib/ui5/template/publish.js

@@ -889,7 +889,7 @@ function normalizeWS(text) {
 
 }
 
-const rStartsWithValidPropertyName = /^(?:[^'"][^\s.]+|'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*")/;
+const rStartsWithValidPropertyName = /^(?:[^'"\s.][^\s.]*|'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*")/;
 
 function isNestedPropertyName(name) {
 	const match = rStartsWithValidPropertyName.exec(name);