Update src/api/chainHead_unstable_storage.md

Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

src/api/chainHead_unstable_storage.md

@@ -63,11 +63,11 @@ If the `type` parameter was `"value"`, `"hash"`, `"descendants-values"` or `"des
 If the `type` parameter was `"value"` or `"hash"`, then it is also guaranteed to be equal to the `key` provided as parameter.
 If the `type` parameter was `"closest-ancestor-merkle-value"`, then the `key` provided as parameter is guaranteed to start with the value in the `key` field.
 
-If the `type` parameter was `"value"` or `"descendants-values"`, then the `value` field is set. The `value` field a string containing the hexadecimal-encoded value of the storage entry.
+If the `type` parameter was `"value"` or `"descendants-values"`, then the `value` field is set. The `value` field is a string containing the hexadecimal-encoded value of the storage entry.
 
-If the `type` parameter was `"hash"` or `"descendants-hashes"`, then the `hash` field is set. The `hash` field a string containing the hexadecimal-encoded hash of the storage entry.
+If the `type` parameter was `"hash"` or `"descendants-hashes"`, then the `hash` field is set. The `hash` field is a string containing the hexadecimal-encoded hash of the storage entry.
 
-If the `type` parameter was `"closest-ancestor-merkle-value"`, then the `merkle-value` field is set and the `key` field indicates which closest ancestor has been found. The `merkle-value` field a string containing the hexadecimal-encoded Merkle value of the storage item indicated by the `key` field.
+If the `type` parameter was `"closest-ancestor-merkle-value"`, then the `merkle-value` field is set and the `key` field indicates which closest ancestor has been found. The `merkle-value` field is a string containing the hexadecimal-encoded Merkle value of the storage item indicated by the `key` field.
 
 Only one of `value`, `hash` or `merkle-value` are set at any given time.