Clean up documentation

README.md

@@ -12,29 +12,30 @@ The msigdbr R package provides Molecular Signatures Database (MSigDB) gene sets
 * in an R-friendly "[tidy](https://r4ds.had.co.nz/tidy-data.html)" format with one gene pair per row
 * for multiple frequently studied model organisms, such as mouse, rat, pig, zebrafish, fly, and yeast, in addition to the original human genes
 * as gene symbols as well as NCBI Entrez and Ensembl IDs
-* without accessing external resources and requiring an active internet connection
+* without accessing external resources requiring an active internet connection
 
 ## Installation
 
 The package can be installed from [CRAN](https://cran.r-project.org/package=msigdbr).
 
-```{r}
+```r
 install.packages("msigdbr")
 ```
 
 Recent [releases](https://github.com/igordot/msigdbr/releases) are not available on CRAN and can be installed from GitHub (specific version can be specified):
 
-```{r}
+```r
 remotes::install_github("igordot/msigdbr", ref = "v2022.1.1")
 ```
 
 ## Usage
 
-The package data can be accessed using the `msigdbr()` function, which returns a data frame of gene sets and their member genes. For example, you can retrieve mouse genes from the C2 (curated) CGP (chemical and genetic perturbations) gene sets.
+The package data can be accessed using the `msigdbr()` function, which returns a data frame of gene sets and their member genes.
+For example, you can retrieve mouse genes from the C2 (curated) CGP (chemical and genetic perturbations) gene sets.
 
-```{r}
+```r
 library(msigdbr)
-genesets = msigdbr(species = "mouse", category = "C2", subcategory = "CGP")
+genesets <- msigdbr(species = "mouse", category = "C2", subcategory = "CGP")
 ```
 
 Check the [documentation website](https://igordot.github.io/msigdbr/articles/msigdbr-intro.html) for more information.