docs: improve documentation for contexts and complete binding

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

Author: deathbeam

README.md

@@ -296,28 +296,24 @@ Also see [here](/lua/CopilotChat/config.lua):
   -- default contexts
   contexts = {
     buffer = {
+      description = 'Includes only the current buffer in chat context. Supports input.',
       -- see config.lua for implementation
-      input = function(callback) end,
-      resolve = function(input, source) end,
     },
     buffers = {
+      description = 'Includes all open buffers in chat context.',
       -- see config.lua for implementation
-      resolve = function(input, source) end,
     },
     file = {
+      description = 'Includes content of provided file in chat context. Supports input.',
       -- see config.lua for implementation
-      input = function(callback) end,
-      resolve = function(input, source) end,
     },
     files = {
+      description = 'Includes all non-hidden filenames in the current workspace in chat context. Supports input.',
       -- see config.lua for implementation
-      input = function(callback) end,
-      resolve = function(input, source) end,
     },
     git = {
+      description = 'Includes current git diff in chat context. Supports input.',
       -- see config.lua for implementation
-      input = function(callback) end,
-      resolve = function(input, source) end,
     },
   },
 
@@ -327,9 +323,8 @@ Also see [here](/lua/CopilotChat/config.lua):
       prompt = '> /COPILOT_EXPLAIN\n\nWrite an explanation for the selected code and diagnostics as paragraphs of text.',
     },
     Review = {
-      -- see config.lua for implementation
       prompt = '> /COPILOT_REVIEW\n\nReview the selected code.',
-      callback = function(response, source) end,
+      -- see config.lua for implementation
     },
     Fix = {
       prompt = '> /COPILOT_GENERATE\n\nThere is a problem in this code. Rewrite the code to show it with the bug fixed.',
@@ -366,7 +361,6 @@ Also see [here](/lua/CopilotChat/config.lua):
   -- default mappings
   mappings = {
     complete = {
-      detail = 'Use @<Tab> or /<Tab> for options.',
       insert ='<Tab>',
     },
     close = {

lua/CopilotChat/config.lua

@@ -283,7 +283,6 @@ return {
   -- default mappings
   mappings = {
     complete = {
-      detail = 'Use @<Tab> or /<Tab> for options.',
       insert = '<Tab>',
     },
     close = {