Fix formatting error in README for term definitions (#331)

Codeberg's flavour of markdown requires a line break between terms in description lists

Reviewed-on: https://codeberg.org/fediverse/fep/pulls/331
Co-authored-by: a <a@trwnh.com>
Co-committed-by: a <a@trwnh.com>

fep/0391/contextProof/README.md

@@ -4,6 +4,7 @@ Provides proof that some object was added to some `context` collection
 
 Domain
 : Object with context set to a Collection that has attributedTo set
+
 Range
 : Add
 

fep/0391/inReplyToProof/README.md

@@ -4,6 +4,7 @@ Provides proof that some object was added to the replies collection of some inRe
 
 Domain
 : Object with inReplyTo set to an Object that has a replies collection
+
 Range
 : Add
 

fep/0391/relationshipProof/README.md

@@ -1,13 +1,19 @@
-relationshipProof <https://w3id.org/fep/0391/relationshipProof>
+# relationshipProof <https://w3id.org/fep/0391/relationshipProof>
 
 Provides proof that the current relationship is reciprocally claimed.
 
-Domain: Relationship
-Range: Relationship | Add | Follow? | Accept Follow?
-Status: Experimental
+Domain
+: Relationship
+
+Range
+: Relationship | Add | Follow? | Accept Follow?
+
+Status
+: Experimental
 
 Example 1:
 
+```json
 {
 	"@context": ["https://www.w3.org/ns/activitystreams", "https://w3id.org/fep/0391"],
 	"id": "https://example.com/some-relationship",
@@ -57,9 +63,11 @@ Example 1:
 		}
 	]
 }
+```
 
 Example 2:
 
+```json
 {
 	"@context": ["https://www.w3.org/ns/activitystreams", "https://w3id.org/fep/0391"],
 	"id": "https://example.com/some-relationship",
@@ -104,4 +112,5 @@ Example 2:
 			"object": "https://example.com/actors/1"
 		}
 	]
-}
+}
+```

fep/888d/exampleA/README.md

@@ -4,6 +4,7 @@ A property with some literal value (string, boolean, number)
 
 Domain
 : SomeType <https://w3id.org/fep/888d/SomeType>
+
 Range
 : String or Boolean or Number
 

fep/888d/exampleB/README.md

@@ -4,6 +4,7 @@ A property that links to another node on the graph (for example, another object)
 
 Domain
 : SomeType <https://w3id.org/fep/888d/SomeType>
+
 Range
 : @id
 

fep/888d/exampleC/README.md

@@ -4,6 +4,7 @@ A property that is an ordered list of literal values that are specifically non-n
 
 Domain
 : SomeType <https://w3id.org/fep/888d/SomeType>
+
 Range
 : List of nonNegativeInteger <http://www.w3.org/2001/XMLSchema#nonNegativeInteger>