[ci skip] Fix typos

Author: cmb69

UPGRADING.INTERNALS

@@ -51,8 +51,8 @@ PHP 7.3 INTERNALS UPGRADE NOTES
      As result some related macros were removed (ZEND_EX_USE_LITERALS,
      EX_LOAD_LITERALS, EX_LITERALS, RT_CONSTANT_EX, EX_CONSTANT) or changed
      (RT_CONSTANT, ZEND_PASS_TWO_UPDATE_CONSTANT, ZEND_PASS_TWO_UNDO_CONSTANT).
-     This change way affect only some "system" extensions. EX_LITERALS,
-     RT_CONSTANT_EX, EX_CONSTANT should be substituted by RT_CONSTANT than now
+     This change may affect only some "system" extensions. EX_LITERALS,
+     RT_CONSTANT_EX, EX_CONSTANT should be substituted by RT_CONSTANT, and now
      use "opline" (instead of "op_array") as first argument.
 
   c. Protection from recursion during processing circular data structures was
@@ -144,7 +144,7 @@ PHP 7.3 INTERNALS UPGRADE NOTES
     retrieve status information of the GC.
 
  v. The should_free argument of the php_add[c]slashes functions has been
-    removed.  It is now always the callers responsibility to free the passed
+    removed.  It is now always the caller's responsibility to free the passed
     string.
 
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