Correct spelling mistakes

(cherry picked from commit 36da7a918f)

modules/programs/zathura.nix

@@ -21,7 +21,7 @@ in
 
   options.programs.zathura = {
     enable = mkEnableOption ''
-      Zathura, a highly customizable and funtional document viewer
+      Zathura, a highly customizable and functional document viewer
       focused on keyboard interaction'';
 
     options = mkOption {

modules/services/polybar.nix

@@ -59,7 +59,7 @@ in
           (p: { "section/base" = { include-file = "${p}"; }; })
           (types.attrsOf types.attrs);
         description = ''
-          Polybar configuration. Can be either path to a file, or set of attibutes
+          Polybar configuration. Can be either path to a file, or set of attributes
           that will be used to create the final configuration.
         '';
         default = {};

modules/services/window-managers/i3.nix

@@ -376,7 +376,7 @@ let
         type = types.attrsOf (types.listOf criteriaModule);
         default = {};
         description = ''
-          An attribute set that assignes applications to workspaces based
+          An attribute set that assigns applications to workspaces based
           on criteria.
         '';
         example = literalExample ''
@@ -473,7 +473,7 @@ let
         type = types.attrs;
         default = {};
         description = ''
-          An attribute set that assignes keypress to an action using key code.
+          An attribute set that assigns keypress to an action using key code.
           See <link xlink:href="https://i3wm.org/docs/userguide.html#keybindings"/>.
         '';
         example = { "214" = "exec --no-startup-id /bin/script.sh"; };