typo

Author: CarloLucibello

src/observation.jl

@@ -4,7 +4,7 @@
 Specify the default observation dimension for `data`.
 Falls back to `nothing` when an observation dimension is undefined.
 
-The default, the following implementations are provided:
+By default, the following implementations are provided:
 - `default_obsdim(A::AbstractArray) = ndims(A)`
 - `default_obsdim(tup::Tuple) = map(default_obsdim, tup)`
 """