Minor fixes for opam file

Signed-off-by: Jon Ludlam <[email protected]>

odoc.opam

@@ -2,29 +2,35 @@ opam-version: "2.0"
 
 version: "dev"
 homepage: "http://github.com/ocaml/odoc"
-doc: "https://github.com/ocaml/odoc#readme"
+doc: "https://ocaml.github.io/odoc/"
 bug-reports: "https://github.com/ocaml/odoc/issues"
 license: "ISC"
 
 authors: [
   "Thomas Refis <[email protected]>"
   "David Sheets <[email protected]>"
   "Leo White <[email protected]>"
+  "Anton Bachin <[email protected]>"
+  "Jon Ludlam <[email protected]>"
 ]
 maintainer: "Anton Bachin <[email protected]>"
 dev-repo: "git+https://github.com/ocaml/odoc.git"
 
 synopsis: "OCaml documentation generator"
+description: """
+Odoc is a documentation generator for OCaml. It reads doc comments,
+delimited with `(** ... *)`, and outputs HTML. 
+"""
 
 depends: [
-  "astring" {build}
-  "cmdliner" {build & >= "1.0.0"}
+  "astring"
+  "cmdliner"
   "cppo" {build}
   "dune"
-  "fpath" {build}
+  "fpath"
   "ocaml" {>= "4.02.0"}
-  "result" {build}
-  "tyxml" {build & >= "4.3.0"}
+  "result"
+  "tyxml" {>= "4.3.0"}
 
   "alcotest" {dev & >= "0.8.3"}
   "markup" {dev & >= "0.8.0"}