Add ADLER32 file checksum algorithm

Resolves GitHub issue spdx#624

Signed-off-by: Sebastian Crane <[email protected]>

chapters/file-information.md

@@ -172,7 +172,7 @@ The metadata for the file checksum field is shown in Table 39.
 | --------- | ----- |
 | Required | Yes |
 | Cardinality | 1..1 [`SHA1`][SHA-1], others may be optionally provided. |
-| Algorithm | [`SHA1`][SHA-1] is to be used on the file. Other algorithms that can be provided optionally include [`SHA224`][SHA-224], [`SHA256`][SHA-256], [`SHA384`][SHA-384], [`SHA512`][SHA-512], [`SHA3-256`][SHA3-256], [`SHA3-384`][SHA3-384], [`SHA3-512`][SHA3-512], [`BLAKE2b-256`][BLAKE2b-256], [`BLAKE2b-384`][BLAKE2b-384], [`BLAKE2b-512`][BLAKE2b-512], [`BLAKE3`][BLAKE3], [`MD2`][MD2], [`MD4`][MD4], [`MD5`][MD5], [`MD6`][MD6] |
+| Algorithm | [`SHA1`][SHA-1] is to be used on the file. Other algorithms that can be provided optionally include [`SHA224`][SHA-224], [`SHA256`][SHA-256], [`SHA384`][SHA-384], [`SHA512`][SHA-512], [`SHA3-256`][SHA3-256], [`SHA3-384`][SHA3-384], [`SHA3-512`][SHA3-512], [`BLAKE2b-256`][BLAKE2b-256], [`BLAKE2b-384`][BLAKE2b-384], [`BLAKE2b-512`][BLAKE2b-512], [`BLAKE3`][BLAKE3], [`MD2`][MD2], [`MD4`][MD4], [`MD5`][MD5], [`MD6`][MD6], [`ADLER32`][ADLER32] |
 | Format | In `tag:value` there are three components, an algorithm identifier (SHA1), a separator (“:”) and a checksum value. The RDF shall also contain an algorithm identifier and a checksum value. For example, when the algorithm identifier is SHA1, the checksum value should be a 160-bit value represented as 40 lowercase hexadecimal digits. For other algorithms, an appropriate number of hexadecimal digits is expected. |
 
 ### 8.4.2 Intent