Update checked checkbox icon to nf-md version, nearly identical

Author: MeanderingProgrammer

README.md

@@ -142,7 +142,7 @@ require('render-markdown').setup({
         -- Character that will replace the [ ] in unchecked checkboxes
         unchecked = '󰄱 ',
         -- Character that will replace the [x] in checked checkboxes
-        checked = ' ',
+        checked = '󰱒 ',
     },
     -- Character that will replace the > at the start of block quotes
     quote = '┃',

doc/render-markdown.txt

@@ -178,7 +178,7 @@ modified by the user.
             -- Character that will replace the [ ] in unchecked checkboxes
             unchecked = '󰄱 ',
             -- Character that will replace the [x] in checked checkboxes
-            checked = ' ',
+            checked = '󰱒 ',
         },
         -- Character that will replace the > at the start of block quotes
         quote = '┃',

lua/render-markdown/init.lua

@@ -133,7 +133,7 @@ M.default_config = {
         -- Character that will replace the [ ] in unchecked checkboxes
         unchecked = '󰄱 ',
         -- Character that will replace the [x] in checked checkboxes
-        checked = ' ',
+        checked = '󰱒 ',
     },
     -- Character that will replace the > at the start of block quotes
     quote = '┃',

tests/init_spec.lua

@@ -320,7 +320,7 @@ async_tests.describe('init', function()
             {
                 row = { 3, 3 },
                 col = { 2, 5 },
-                virt_text = { { '  ', '@markup.heading' } },
+                virt_text = { { ' 󰱒 ', '@markup.heading' } },
                 virt_text_pos = 'overlay',
             },
         })