docs: Doc tweak

Author: Alan Christie

decoder/job-definition-schema.yaml

@@ -189,11 +189,11 @@ definitions:
     pattern: '^([1-9][0-9]{2,3}Mi|[1-9][0-9]{0,1}Gi)$'
 
   # The 'combine' trait.
-  # This declares the name of an input that is typically
+  # This declares the name of an input vbariable that is typically
   # a series of files that the job combines, producing a single output.
-  # A job with a 'combine' trait is esentially a "combiner" - somewthing
+  # A job with a 'combine' trait is esentially a "combiner" - something
   # that processes a number of files, all presented to the Job via
-  # the named variable. If the Job combines files using its "--source"
+  # tonehe named variable. If the Job combines files using its "--source"
   # input property it would have a "combine: source" trait.
   #
   # The value of the "combine" property should be the name of an