add new keypmap for quick selecting first entry

doc/test-samurai.txt

@@ -51,16 +51,20 @@ QUICK-HELP & FLOATS                                   *test-samurai-quickhelp*
 In the Testing-Float, press ? to open the quick-help in the Detail-Float.
 
 Additional keymaps:
+Listing navigation:
+  <leader>fn    [F]ind [N]ext failed test in listing
+  <leader>fp    [F]ind [P]revious failed test in listing
+  <leader>o     Jump to test location
   <leader>qn    Close floats + jump to the first quickfix entry
-  <leader>nf    Next [ FAIL ] in listing
-  <leader>pf    Previous [ FAIL ] in listing
+Listing filters:
   <leader>sf    Filter listing to [ FAIL ] only
   <leader>ss    Filter listing to [ SKIP ] only
   <leader>sa    Show all listing entries (clear filter)
+Listing actions:
   <leader>tt    Run the test under the cursor in the listing
   <leader>cb    breaks test-command onto multiple lines (clears search highlight)
   <leader>cj    joins test-command onto single line
-  <leader>o     Jump to test location
+Testing-Float:
   <leader>z     Toggle Detail-Float full width
   <C-l>         Focus Detail-Float (press l again for full)
   <C-h>         Focus Test-Listing-Float