[ci skip] Fix formatting in UPGRADING

- Remove `k` typo that was accidentally added in a headline separator.
- Remove premature hard break after very short line length.
- Remove dots at the end of constant lists (not used in 8.2).

Author: TimWolla

UPGRADING

@@ -37,11 +37,10 @@ PHP 8.3 UPGRADE NOTES
 
 ========================================
 6. New Functions
-=======================k=================
+========================================
 
 - Posix:
-  . Added posix_sysconf call to get runtime
-  informations.
+  . Added posix_sysconf call to get runtime informations.
 
 ========================================
 7. New Classes and Interfaces
@@ -60,10 +59,10 @@ PHP 8.3 UPGRADE NOTES
 ========================================
 
 - Posix:
-  . POSIX_SC_ARG_MAX.
-  . POSIX_SC_PAGESIZE.
-  . POSIX_SC_NPROCESSORS_CONF.
-  . POSIX_SC_NPROCESSORS_ONLN.
+  . POSIX_SC_ARG_MAX
+  . POSIX_SC_PAGESIZE
+  . POSIX_SC_NPROCESSORS_CONF
+  . POSIX_SC_NPROCESSORS_ONLN
 
 ========================================
 11. Changes to INI File Handling