Improve reference documentation

docs/cmake-toml.md

@@ -137,6 +137,7 @@ components = ["mycomponent"]
 condition = "mycondition"
 git = "https://github.com/myuser/gitcontent"
 tag = "v0.1"
+shallow = false
 
 [fetch-content.svncontent]
 condition = "mycondition"
@@ -146,7 +147,10 @@ rev = "svn_rev"
 [fetch-content.urlcontent]
 condition = "mycondition"
 url = "https://content-host.com/urlcontent.zip"
-hash = "123123123123"
+# These are equivalent, supported algorithms:
+# md5, sha1, sha224, sha256, sha384, sha512, sha3_224, sha3_256, sha3_384, sha3_512
+hash = "SHA1 502a4e25b8b209889c99c7fa0732102682c2e4ff"
+sha1 = "502a4e25b8b209889c99c7fa0732102682c2e4ff"
 ```
 
 ## Targets