Lua/LIQ: added from p in <<expr>> as a syntax variant (and preferred

option) for `from p = <<expr>>`. Updated docs accordingly.

client/space_lua/parse-lua.terms.js

@@ -17,16 +17,16 @@ export const
   Query = 60,
   QueryClause = 62,
   FromClause = 63,
-  WhereClause = 65,
-  OrderByClause = 67,
-  OrderBy = 70,
-  SelectClause = 72,
-  LimitClause = 74,
-  IfStatement = 79,
-  ForStatement = 84,
-  ForNumeric = 86,
-  ForGeneric = 87,
-  NameList = 88,
+  WhereClause = 66,
+  OrderByClause = 68,
+  OrderBy = 71,
+  SelectClause = 73,
+  LimitClause = 75,
+  IfStatement = 80,
+  ForStatement = 85,
+  ForNumeric = 87,
+  ForGeneric = 88,
+  NameList = 89,
   ExpList = 90,
   FuncName = 92,
   VarList = 96,