[keymaps] Remove some comments

plugin/20_keymaps.lua

@@ -34,18 +34,6 @@ nmap(']p', '<Cmd>exe "put "  . v:register<CR>', 'Paste Below')
 -- In 'plugin/10_options.lua' <Leader> is set to <Space>, i.e. press <Space>
 -- whenever there is a suggestion to press <Leader>.
 --
--- This config uses a "two key Leader mappings" approach: first key describes
--- semantic group, second key executes an action. Both keys are usually chosen
--- to create some kind of mnemonic.
--- Example: `<Leader>f` groups "find" type of actions; `<Leader>ff` - find files.
--- Use this section to add Leader mappings in a structural manner.
---
--- Usually if there are global and local kinds of actions, lowercase second key
--- denotes global and uppercase - local.
--- Example: `<Leader>fs` / `<Leader>fS` - find workspace/document LSP symbols.
---
--- Many of the mappings use 'mini.nvim' modules set up in 'plugin/30_mini.lua'.
-
 -- Create a global table with information about Leader groups in certain modes.
 -- This is used to provide 'mini.clue' with extra clues.
 -- Add an entry if you create a new group.