Understand how LSP features works

[chemzqm]

New sections are added to the doc

LSP features 					|coc-lsp|
  Document 					|coc-document|
  Completion					|coc-completion|
  Diagnostics 					|coc-diagnostics|
  Signature help 				|coc-signature|
  Code action 					|coc-code-actions|
  Document highlights 				|coc-document-highlights|
  Snippets 					|coc-snippets|
  Workspace					|coc-workspace|
  Cursors 					|coc-cursors|
  Outline 					|coc-outline|
  Call hierarchy 				|coc-callHierarchy|
  Semantic highlights 				|coc-semantic-highlights|

Make sure to check them out.