🔨 Update mfprep comment

buildroot/share/git/mfprep

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 # mfprep tag1 [tag2]
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-# Find commits in bugfix-2.1.x that are not yet in 2.0.x.
+# Find commits in bugfix-2.1.x that are not yet in 2.1.x.
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 # Specify a version tag to start from, and optional version tag to end at.
 # For bugfix-2.1.x the tag will be prefixed by dev- to distinguish it from the version tag,