[Task] cryostat README.md typo for sha256 command

[maxcao13]

In the docs, under https://github.com/cryostatio/cryostat/blob/main/README.md#user-authentication--authorization

It says

Where abc123 and def987 are substituted for the SHA-256 sum hexes of the desired user passwords. These can be obtained by ex. echo -n PASS | sha256sum | cut -d' ' -f1'.

echo -n PASS | sha256sum | cut -d' ' -f1' should be echo -n PASS | sha256sum | cut -d' ' -f1