docs: update README and vimdoc

README.md

@@ -211,7 +211,8 @@ This can have several reasons:
     to show the colored column in normal mode.
 
 2. Please make sure you have set `colorcolumn` to a value greater than 0 in
-   your config.
+   your config. Also, make sure that you have `termguicolors` set using
+   `:set termguicolors`
 
 3. If you set `colorcolumn` to a relative value (e.g. `'-10'`), make sure
    `textwidth` is set to a value greater than 0.

doc/deadcolumn.nvim.txt

@@ -213,21 +213,6 @@ deadcolumn.setup({*opts})                         *deadcolumn.options.setup()*
 ==============================================================================
 FAQ                                                           *deadcolumn.faq*
 
-------------------------------------------------------------------------------
-Why `:echo &cc` or `lua =vim.wo.cc` is empty?
-*deadcolumn.faq.cc-is-empty*
-
-If you are using the default config, this is expected.
-
-The default config makes 'colorcolumn' visible only in insert mode and replace
-mode, so it clears 'cc' in normal mode and reset it to the original value when
-you enter insert mode or replace mode. As long as the 'colorcolumn' is
-displayed correctly in insert mode and replace mode, you don't need to worry
-about this.
-
-If you want to see 'colorcolumn' in normal mode, you can change the option
-|deadcolumn.options.ops.modes|.
-
 ------------------------------------------------------------------------------
 Why can’t I see the colored column?
 *deadcolumn.faq.colorcolumn-not-visible*
@@ -240,10 +225,7 @@ This can have several reasons:
    |deadcolumn.options.ops.modes| to show the colored column in normal mode.
 
 2. Please make sure you have set 'colorcolumn' to a value greater than 0 in
-   your config. Notice that the output of `:echo &cc` or `lua =vim.wo.cc` may
-   be empty even if you have set 'colorcolumn' to a value greater than 0. This
-   is because this plugin clears 'colorcolumn' when it is not needed to
-   conceal the colored column, see point 1.
+   your config. Also, make sure that you have 'termguicolors' set.
 
 3. If you set 'colorcolumn' to a relative value (e.g. "-10"), make sure
    'textwidth' is set to a value greater than 0.