First pass at uniformed types, specs and docs

- spec public functions (skipping controllers, views, live views and
components)
- use types instead of explanations in docs
- remove redundant docs
- fix typos

lib/sqlite_vec/ecto/query.ex

@@ -75,6 +75,9 @@ defmodule SqliteVec.Ecto.Query do
     end
   end
 
+  @doc """
+  Matches a vector against a virtual table using the `match` operator.
+  """
   defmacro vec_match(a, b) do
     quote do
       fragment("? match ?", unquote(a), unquote(b))