docs(statusline): fix spelling error

Author: mariusz-tang

doc/mini-statusline.txt

@@ -62,7 +62,7 @@ Highlight used in default statusline:
 - `MiniStatuslineFileinfo` - for |MiniStatusline.section_fileinfo()| section.
 
 Other groups:
-- `MiniStatuslineInactive` - highliting in not focused window.
+- `MiniStatuslineInactive` - highlighting in not focused window.
 
 To change any highlight group, set it directly with |nvim_set_hl()|.
 

lua/mini/statusline.lua

@@ -60,7 +60,7 @@
 --- - `MiniStatuslineFileinfo` - for |MiniStatusline.section_fileinfo()| section.
 ---
 --- Other groups:
---- - `MiniStatuslineInactive` - highliting in not focused window.
+--- - `MiniStatuslineInactive` - highlighting in not focused window.
 ---
 --- To change any highlight group, set it directly with |nvim_set_hl()|.
 ---