fix doctests on v1.4 (#302)

Author: jishnub

src/axes.jl

@@ -22,7 +22,7 @@ julia> ro[-1]
 -1
 
 julia> ro[3]
-ERROR: BoundsError: attempt to access 3-element IdOffsetRange{$Int, UnitRange{$Int}} with indices -1:1 at index [3]
+ERROR: BoundsError: attempt to access 3-element $(IdOffsetRange{Int, UnitRange{Int}}) with indices -1:1 at index [3]
 ```
 
 If the range doesn't start at 1, the values may be different from the indices:
@@ -37,7 +37,7 @@ julia> ro[-1]
 9
 
 julia> ro[3]
-ERROR: BoundsError: attempt to access 3-element IdOffsetRange{$Int, UnitRange{$Int}} with indices -1:1 at index [3]
+ERROR: BoundsError: attempt to access 3-element $(IdOffsetRange{Int, UnitRange{Int}}) with indices -1:1 at index [3]
 ```
 
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