fix the ascii art

unfortunately cabal-fmt doesn't know about it

tahoe-capabilities.cabal

@@ -18,9 +18,9 @@ name:            tahoe-capabilities
 -- See the Haskell package versioning policy (PVP) for standards
 -- guiding when and how versions should be incremented.
 -- https://pvp.haskell.org
--- PVP summary:     +-+------- breaking API changes
---                  | | +----- non-breaking API additions
---                  | | | +--- code changes with no API change
+-- PVP summary:  +-+------- breaking API changes
+--               | | +----- non-breaking API additions
+--               | | | +--- code changes with no API change
 version:         0.1.0.0
 
 -- A short (one-line) description of the package.