docs: update blob data type available conversions

Slice and array had been omitted from the documentation, so they are
added now. Also, the `Bytes` type is added as a conversion for `Blob`,
following the previous commit's change to support it.

Author: wprzytula

docs/source/data-types/blob.md

@@ -1,5 +1,9 @@
 # Blob
-`Blob` is represented as `Vec<u8>`
+`Blob` is represented as one of:
+- `&[u8]`,
+- `Vec<u8>`,
+- `bytes::Bytes`,
+- `[u8; N]` (only serialization supported).
 
 
 ```rust
@@ -26,4 +30,4 @@ while let Some((blob_value,)) = stream.try_next().await? {
 }
 # Ok(())
 # }
-```
+```

docs/source/data-types/data-types.md

@@ -18,7 +18,7 @@ Database types and their Rust equivalents:
 * `Double` <----> `f64`
 * `Ascii`, `Text`, `Varchar` <----> `&str`, `String`, `Box<str>`, `Arc<str>`
 * `Counter` <----> `value::Counter`
-* `Blob` <----> `Vec<u8>`
+* `Blob` <----> `&[u8]`, `Vec<u8>`, `Bytes`, (and `[u8; N]` for serialization only)
 * `Inet` <----> `std::net::IpAddr`
 * `Uuid` <----> `uuid::Uuid`
 * `Timeuuid` <----> `value::CqlTimeuuid`