Update xlabel to ylabel in UnitfulConversion documentation. (#4825)

Author: ckumarad

src/dim-converts/unitful-integration.jl

@@ -137,7 +137,7 @@ using Unitful, CairoMakie
 scatter(1:4, [1u"ns", 2u"ns", 3u"ns", 4u"ns"])
 ```
 
-Fix unit to always use Meter & display unit in the xlabel:
+Fix unit to always use Meter & display unit in the ylabel:
 ```julia
 uc = Makie.UnitfulConversion(u"m"; units_in_label=false)
 scatter(1:4, [0.01u"km", 0.02u"km", 0.03u"km", 0.04u"km"]; axis=(dim2_conversion=uc, ylabel="y (m)"))