[text.encoding.id] Sort enumerators in ascending order

Some enumerators of `std::text_encoding::id` are listed out of order. It's probably better to sort them in ascending order.

Author: frederick-vs-ja

source/text.tex

@@ -5572,6 +5572,8 @@
     VenturaInternational = 2007,
     DECMCS = 2008,
     PC850Multilingual = 2009,
+    PCp852 = 2010,
+    PC8CodePage437 = 2011,
     PC8DanishNorwegian = 2012,
     PC862LatinHebrew = 2013,
     PC8Turkish = 2014,
@@ -5604,10 +5606,8 @@
     IBM420 = 2041,
     IBM423 = 2042,
     IBM424 = 2043,
-    PC8CodePage437 = 2011,
     IBM500 = 2044,
     IBM851 = 2045,
-    PCp852 = 2010,
     IBM855 = 2046,
     IBM857 = 2047,
     IBM860 = 2048,