minor modifications following @prioux code review

BrainPortal/app/models/tool_config.rb

@@ -342,11 +342,11 @@ def container_rules #:nodoc:
 
     if self.container_engine.present? && self.container_engine == "Singularity" 
       if self.container_index_location.present? && ! /^[a-z0-9]+\:\/\/$/.match(self.container_index_location)
-        errors[:container_index_location] = "Invalid index location type for container engine Singularity. Should end in '://'."
+        errors[:container_index_location] = "is invalid for container engine Singularity. Should end in '://'."
       end
     elsif self.container_engine.present? && self.container_engine == "Docker"
       if self.container_index_location.present? && ! /^[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,6}$/.match(self.container_index_location)
-        errors[:container_index_location] = "Invalid index location type for container engine Docker. Should be a valid hostname."
+        errors[:container_index_location] = "is invalid for container engine Docker. Should be a valid hostname."
       end
     end
     return errors.empty?

BrainPortal/app/views/tool_configs/_form_fields.html.erb

@@ -104,7 +104,7 @@
     <p><%= f.label :containerhub_image_name, "Container image name:" %><br/>
       <%= f.text_field :containerhub_image_name %><br/>
       <div class="field_explanation">
-        The name and tag of the Container image in which the tool is installed,
+        The name and tag of the container image in which the tool is installed,
         for instance "centos:latest". This name refers to the Docker/Singulariry index
         accessed by the Bourreau, which is configured manually in the Bourreau
         for now.
@@ -116,8 +116,10 @@
     <p><%= f.label :container_index_location, "Index of the container image:" %><br/>
       <%= f.text_field :container_index_location %><br>
       <div class="field_explanation">
-        The index/url of the Container image in which the docker/singularity container is
-        accessible through. Examples are: quay.io, index.docker.io (default).
+        The index/url of the container image in which the docker/singularity container is
+        accessible through.
+        Examples for Docker are: quay.io, index.docker.io (default).
+        Examples for Singularity are: docker://, shub:// (default).
       </div>
     </p>
   </span>
@@ -126,7 +128,7 @@
     <p><%= f.label :container_image_userfile_id, "ID of the container image:" %><br/>
       <%= f.text_field :container_image_userfile_id %> <%= link_to_userfile_if_accessible(@tool_config.container_image) %><br>
       <div class="field_explanation">
-        The ID number of the Container image in which the tool is installed.
+        The ID number of the container image in which the tool is installed.
         This ID refers to userfile registered in CBRAIN.
       </div>
     </p>

BrainPortal/app/views/tool_configs/_tool_configs_table.html.erb

@@ -106,9 +106,7 @@
 
     t.column("Container Index", :container_index_location,
     ) { |tc|
-        if tc.container_index_location.present?
-          tc.container_index_location
-        end
+        tc.container_index_location
       }
 
     t.column("Description", :description,