Improve weight icon

app/views/projects/issues/_issue.html.haml

@@ -47,7 +47,7 @@
     - if issue.weight
        
       %span
-        = icon('magnet')
+        = icon('balance-scale')
         = issue.weight
 
     .pull-right.issue-updated-at

app/views/shared/issuable/_sidebar.html.haml

@@ -63,7 +63,7 @@
               = link_to 'Edit', '#', class: 'edit-link'
         .value
           - if issuable.weight
-            = icon('magnet')
+            = icon('balance-scale')
             = issuable.weight
           - else
             .light None

doc/workflow/issue_weight.md

@@ -8,7 +8,7 @@ You can set the weight of an issue during its creation, by simply changing the
 value in the dropdown menu. You can set it to a numeric value from 1 to 9.
 
 This value will appear on the right sidebar of an individual issue, as well as
-in the issues page next to a distinctive magnet icon.
+in the issues page next to a distinctive balance scale icon.
 
 As an added bonus, you can see the total sum of all issues on the milestone page.