Wrong documentation linked for scale_color_continuous with American spelling

[Ahobert]

Calling the documentation of scale_colour_continuous seems to work properly only with British spelling. Running ?scale_color_continuous calls the documentation of scale_colour_gradient instead.

related to issues #2851 and #3053

--

install.packages("ggplot2")
#> package 'ggplot2' successfully unpacked and MD5 sums checked
#> 
#> The downloaded binary packages are in

library(ggplot2)
?scale_colour_continuous
?scale_color_continuous

sessionInfo()
#> R version 3.6.0 (2019-04-26)
#> Platform: x86_64-w64-mingw32/x64 (64-bit)
#> Running under: Windows 10 x64 (build 14393)
#> 
#> Matrix products: default
#> 
#> locale:
#> [1] LC_COLLATE=German_Germany.1252  LC_CTYPE=German_Germany.1252   
#> [3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C                   
#> [5] LC_TIME=German_Germany.1252    
#> 
#> attached base packages:
#> [1] stats     graphics  grDevices utils     datasets  methods   base     
#> 
#> other attached packages:
#> [1] ggplot2_3.2.0
#> 
#> loaded via a namespace (and not attached):
#>  [1] Rcpp_1.0.1       knitr_1.22       magrittr_1.5     tidyselect_0.2.5
#>  [5] munsell_0.5.0    colorspace_1.4-1 R6_2.4.0         rlang_0.3.4     
#>  [9] stringr_1.4.0    highr_0.8        dplyr_0.8.0.1    tools_3.6.0     
#> [13] grid_3.6.0       gtable_0.3.0     xfun_0.6         withr_2.1.2     
#> [17] htmltools_0.3.6  assertthat_0.2.1 yaml_2.2.0       lazyeval_0.2.2  
#> [21] digest_0.6.18    tibble_2.1.1     crayon_1.3.4     purrr_0.3.2     
#> [25] glue_1.3.1       evaluate_0.13    rmarkdown_1.12   stringi_1.4.3   
#> [29] compiler_3.6.0   pillar_1.3.1     scales_1.0.0     pkgconfig_2.0.2

<sup>Created on 2019-07-08 by the [reprex package](https://reprex.tidyverse.org) (v0.2.1)</sup>

[paleolimbot]

Good catch! I think this can be fixed by updating the @rdname tag here to scale_colour_continuous:

ggplot2/R/zxx.r

Lines 112 to 115 in a312cb4

	#' @export
	#' @rdname scale_gradient
	#' @usage NULL
	scale_color_continuous <- scale_colour_continuous

[karawoo]

Closed in #3430, thanks!

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