Update getting_started.md
diff --git a/docs/getting_started.md b/docs/getting_started.md
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@@ -553,9 +553,9 @@
1. Set up the key derivation context using the `psa_key_derivation_setup()`
function, specifying the derivation algorithm `PSA_ALG_HKDF(PSA_ALG_SHA_256)`.
-1. Provide `salt` (optional) with `psa_key_derivation_input_bytes()`.
-1. Provide `info` with `psa_key_derivation_input_bytes()`.
-1. Provide `secret` with `psa_key_derivation_input_key()`, referencing a key that
+1. Provide an optional salt with `psa_key_derivation_input_bytes()`.
+1. Provide info with `psa_key_derivation_input_bytes()`.
+1. Provide a secret with `psa_key_derivation_input_key()`, referencing a key that
can be used for key derivation.
1. Set the key attributes desired for the new derived key. We'll set
the `PSA_KEY_USAGE_ENCRYPT` usage flag and the `PSA_ALG_CTR` algorithm for this
