Update cheatsheets

b3sum

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# b3sum
+
+> Calculate BLAKE3 cryptographic checksums.
+> More information: <https://github.com/BLAKE3-team/BLAKE3/tree/master/b3sum>.
+
+- Calculate the BLAKE3 checksum for one or more files:
+
+`b3sum {{path/to/file1 path/to/file2 ...}}`
+
+- Calculate and save the list of BLAKE3 checksums to a file:
+
+`b3sum {{path/to/file1 path/to/file2 ...}} > {{path/to/file.b3}}`
+
+- Calculate a BLAKE3 checksum from `stdin`:
+
+`{{command}} | b3sum`
+
+- Read a file of BLAKE3 sums and filenames and verify all files have matching checksums:
+
+`b3sum --check {{path/to/file.b3}}`
+
+- Only show a message for missing files or when verification fails:
+
+`b3sum --check --quiet {{path/to/file.b3}}`