Issue #28394: Spelling and typo fixes in code comments and changelog

Includes patch by Ville Skyttä.
diff --git a/Misc/HISTORY b/Misc/HISTORY
index fa2e3c7..88cb286 100644
--- a/Misc/HISTORY
+++ b/Misc/HISTORY
@@ -9016,7 +9016,7 @@
 - Issue #5976: Fixed Distutils test_check_environ.
 
 - Issue #5941: Distutils build_clib command was not working anymore because
-  of an incomplete costumization of the archiver command. Added ARFLAGS in the
+  of an incomplete customization of the archiver command. Added ARFLAGS in the
   Makefile besides AR and make Distutils use it. Original patch by David
   Cournapeau.
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 4c4bb8e..d71a41b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -484,7 +484,7 @@
   make time when --with-optimizations is enabled.  Also improve our
   ability to find the llvm-profdata tool on MacOS and some Linuxes.
 
-- Issue #26307: The profile-opt build now applys PGO to the built-in modules.
+- Issue #26307: The profile-opt build now applies PGO to the built-in modules.
 
 - Issue #26359: Add the --with-optimizations configure flag.