Fix spelling

Author: CKolkey

lua/neogit/lib/git/stash.lua

@@ -93,7 +93,7 @@ function M.register(meta)
       local idx, message = line:match("stash@{(%d*)}: (.*)")
 
       idx = tonumber(idx)
-      assert(idx, "indx cannot be nil")
+      assert(idx, "index cannot be nil")
 
       ---@class StashItem
       local item = {

lua/neogit/lib/graph/kitty.lua

@@ -998,7 +998,7 @@ function M.build(commits, color)
       end
     end
 
-    -- now lets get the intervals between the stopped connetors
+    -- now lets get the intervals between the stopped connectors
     -- and other connectors of the same commit hash
     local intervals = {}
     for _, j in ipairs(stopped) do