chore: fix typos

Author: atrigila

docs/usage.md

@@ -197,7 +197,7 @@ contrasts:
     make_contrasts_str: "conditiontreated"
 ```
 
-The necessary fields in order are::
+The necessary fields in order are:
 
 - `formula` - A string representation of the model formula. It is used to build the design matrix.
 - `make_contrasts_str` - An explicit literal contrast string (e.g., "treatmenthND6 - treatmentmCherry") that is passed directly to [`limma::makeContrasts()`](https://rdrr.io/bioc/limma/man/makeContrasts.html) in `VARIANCEPARTITION_DREAM`. The parameter names must be syntactically valid variable names in R (see [`make.names`](https://stat.ethz.ch/R-manual/R-devel/library/base/html/make.names.html)). This field provides full control for complex designs. Requires `formula`.

workflows/differentialabundance.nf

@@ -187,12 +187,12 @@ workflow DIFFERENTIALABUNDANCE {
             .map { entry ->
                 def yaml_file = entry[1]
                 def yaml_data = new groovy.yaml.YamlSlurper().parse(yaml_file)
-                yaml_data.contrasts.collect { constrast ->
-                    if (constrast.containsKey('formula')) {
-                        tuple('id': constrast.id)
+                yaml_data.contrasts.collect { contrast ->
+                    if (contrast.containsKey('formula')) {
+                        tuple('id': contrast.id)
                     }
-                    else if (constrast.containsKey('comparison')) {
-                        tuple('id': constrast.comparison[0])
+                    else if (contrast.containsKey('comparison')) {
+                        tuple('id': contrast.comparison[0])
                     }
                 }
             }