Some changes

init.el

@@ -643,6 +643,8 @@ visual states."
 (use-package corfu
   :bind (("M-<tab>" . completion-at-point)
          :map corfu-map
+         ("C-j" . corfu-next)
+         ("C-k" . corfu-previous)
          ("M-SPC" . corfu-insert-separator)
          ("M-m" . my/corfu-move-to-minibuffer))
   :init
@@ -1127,6 +1129,17 @@ otherwise, call `bibtex-find-text'."
   (add-to-list 'major-mode-remap-alist '(doctex-mode . docTeX-mode))
   (add-to-list 'auto-mode-alist '("/\\.latexmkrc\\'" . perl-mode))
   :config
+  (defun my/-auctex-texdoc-setup-env (oldfun &rest args)
+    (let ((process-environment))
+      (if (display-graphic-p)
+          (progn (setenv "MDVIEWER_texdoc" "emacsclient")
+                 (setenv "PDFVIEWER_texdoc" "emacsclient")
+                 (setenv "PAGER_texdoc" "emacsclient"))
+        (setenv "MDVIEWER_texdoc" "emacsclient -nw")
+        (setenv "PDFVIEWER_texdoc" "evince")
+        (setenv "PAGER_texdoc" "emacsclient -nw"))
+      (apply oldfun args)))
+  (advice-add 'TeX-documentation-texdoc :around 'my/-auctex-texdoc-setup-env)
   (defun my/-setup-LaTeX-mode ()
     (setq evil-lookup-func 'latex-help-at-point))
   (setq TeX-auto-save t
@@ -1541,8 +1554,8 @@ argument."
          (eshell-load . eat-eshell-mode)
          (eshell-mode . my/-eshell-mode-setup))
   :bind (:map eshell-mode-map
-         ("TAB" . company-complete)
-         ("<tab>" . company-complete))
+         ("TAB" . completion-at-point)
+         ("<tab>" . completion-at-point))
   :init
   (defun my/-eshell-mode-setup ()
     "Setup function run from `eshell-mode-hook'"