Fix typos mostly in comments, docs and test names (GH-15209)
diff --git a/Include/pyhash.h b/Include/pyhash.h
index 9cfd071..dbcc974 100644
--- a/Include/pyhash.h
+++ b/Include/pyhash.h
@@ -119,7 +119,7 @@
* configure script.
*
* - FNV is available on all platforms and architectures.
- * - SIPHASH24 only works on plaforms that don't require aligned memory for integers.
+ * - SIPHASH24 only works on platforms that don't require aligned memory for integers.
* - With EXTERNAL embedders can provide an alternative implementation with::
*
* PyHash_FuncDef PyHash_Func = {...};