Terminate API code blocks correctly

They were missing trailing newlines, so as you can see in the diff, some
transcripts had invalid output.

unison-cli/src/Unison/Codebase/TranscriptParser.hs

@@ -432,7 +432,7 @@ run verbosity dir stanzas codebase runtime sbRuntime nRuntime config ucmVersion
                   API apiRequests -> do
                     liftIO (output "``` api\n")
                     liftIO (for_ apiRequests apiRequest)
-                    liftIO (output "```")
+                    liftIO (output "```\n\n")
                     awaitInput
                   Ucm hide errOk cmds -> do
                     liftIO (writeIORef hidden hide)

unison-src/transcripts/api-doc-rendering.output.md

@@ -940,4 +940,5 @@ GET /api/projects/scratch/branches/main/getDefinition?names=term
     },
     "typeDefinitions": {}
 }
-```
+```
+

unison-src/transcripts/api-find.output.md

@@ -252,4 +252,5 @@ GET /api/projects/scratch/branches/main/find?query=joey.http
         }
     ]
 ]
-```
+```
+

unison-src/transcripts/api-getDefinition.output.md

@@ -205,7 +205,9 @@ GET /api/projects/scratch/branches/main/getDefinition?names=%23qkhkl0n238&relati
     },
     "typeDefinitions": {}
 }
-`````` unison
+```
+
+``` unison
 doctest.thing.doc = {{ The correct docs for the thing }}
 doctest.thing = "A thing"
 doctest.thingalias.doc = {{ Docs for the alias, should not be displayed }}
@@ -332,7 +334,9 @@ GET /api/projects/scratch/branches/main/getDefinition?names=thing&relativeTo=doc
     },
     "typeDefinitions": {}
 }
-```If we request a doc, the api should return the source, but also the rendered doc should appear in the 'termDocs' list.
+```
+
+If we request a doc, the api should return the source, but also the rendered doc should appear in the 'termDocs' list.
 
 ``` api
 GET /api/projects/scratch/branches/main/getDefinition?names=thing.doc&relativeTo=doctest
@@ -507,4 +511,5 @@ GET /api/projects/scratch/branches/main/getDefinition?names=thing.doc&relativeTo
     },
     "typeDefinitions": {}
 }
-```
+```
+

unison-src/transcripts/api-list-projects-branches.output.md

@@ -53,4 +53,5 @@ GET /api/projects/project-one/branches?prefix=branch-t
         "branchName": "branch-two"
     }
 ]
-```
+```
+

unison-src/transcripts/api-namespace-details.output.md

@@ -78,4 +78,5 @@ GET /api/projects/scratch/branches/main/namespaces/nested.names
         "tag": "Paragraph"
     }
 }
-```
+```
+

unison-src/transcripts/api-namespace-list.output.md

@@ -131,4 +131,5 @@ GET /api/projects/scratch/branches/main/list?namespace=names&relativeTo=nested
     "namespaceListingFQN": "nested.names",
     "namespaceListingHash": "#oms19b4f9s3c8tb5skeb8jii95ij35n3hdg038pu6rv5b0fikqe4gd7lnu6a1i6aq5tdh2opdo4s0sfrupvk6vfkr9lf0n752gbl8o0"
 }
-```
+```
+

unison-src/transcripts/api-summaries.output.md

@@ -667,7 +667,9 @@ GET /api/projects/scratch/branches/main/definitions/terms/by-hash/@@IO.putBytes.
     },
     "tag": "Plain"
 }
-```## Type Summary APIs
+```
+
+## Type Summary APIs
 
 ``` api
 --  data
@@ -823,4 +825,5 @@ GET /api/projects/scratch/branches/main/definitions/types/by-hash/@@Nat/summary?
     },
     "tag": "Data"
 }
-```
+```
+

unison-src/transcripts/definition-diff-api.output.md

@@ -558,7 +558,9 @@ GET /api/projects/diffs/diff/terms?oldBranchRef=main&newBranchRef=new&oldTerm=te
     },
     "project": "diffs"
 }
-```Diff types
+```
+
+Diff types
 
 ``` api
 GET /api/projects/diffs/diff/types?oldBranchRef=main&newBranchRef=new&oldType=Type&newType=Type
@@ -804,4 +806,5 @@ GET /api/projects/diffs/diff/types?oldBranchRef=main&newBranchRef=new&oldType=Ty
     },
     "project": "diffs"
 }
-```
+```
+