PEP 803: fix a couple typos (#4728)

Author: neutrinoceros

peps/pep-0803.rst

@@ -453,7 +453,7 @@ Values in the *Note* column:
 * *new*: Proposed in this PEP.
 * *reserved*: A mechanism to build a matching extension is not proposed in
   this PEP, but may be added in the future.
-  Installers should be brepared to handle the tag.
+  Installers should be prepared to handle the tag.
 * *out of spec*: Should not be used as-is: extensions should be tagged
   ``abi3.abi3t`` rather than only ``abi3``.
   The entry is included for installers that decompose compressed tag sets.
@@ -520,7 +520,7 @@ of the stable ABI, preventing future adjustments.
 Shims for compatibility with CPython 3.14
 -----------------------------------------
 
-It’s possible to build a ``cp314-abi3.abi3t`` extenstion – one compatible
+It’s possible to build a ``cp314-abi3.abi3t`` extension – one compatible
 with 3.14 (both free-threaded build and default).
 There are several challenges around this: