Fix typos / improve syntax

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/ChangeLog.d/driver-only-cipher.txt b/ChangeLog.d/driver-only-cipher.txt
index e2a946c..331b2f9 100644
--- a/ChangeLog.d/driver-only-cipher.txt
+++ b/ChangeLog.d/driver-only-cipher.txt
@@ -2,7 +2,7 @@
    * If a cipher or AEAD mechanism has a PSA driver, you can now build the
      library without the corresponding built-in implementation. Generally
      speaking that requires both the key type and algorithm to be accelerated
-     or they'll both be built in. However for CCM and GCM the built-in
+     or they'll both be built in. However, for CCM and GCM the built-in
      implementation is able to take advantage of a driver that only
      accelerates the key type (that is, the block cipher primitive). See
      docs/driver-only-builds.md for full details and current limitations.
diff --git a/ChangeLog.d/no-cipher.txt b/ChangeLog.d/no-cipher.txt
index 4deadab..87f2f6d 100644
--- a/ChangeLog.d/no-cipher.txt
+++ b/ChangeLog.d/no-cipher.txt
@@ -1,7 +1,7 @@
 Features
    * Fewer modules depend on MBEDTLS_CIPHER_C, making it possible to save code
      size by disabling it in more circumstances. In particular, the CCM and
-     GCM modules no longer depends on MBEDTLS_CIPHER_C. Also,
+     GCM modules no longer depend on MBEDTLS_CIPHER_C. Also,
      MBEDTLS_PSA_CRYPTO can now be enabled without MBEDTLS_CIPHER_C if all
      unauthenticated (non-AEAD) ciphers are disabled, or if they're all
      fully provided by drivers. See docs/driver-only-builds.md for full