Revise term/vterm/eshell commands & keybinds

The semantics of SPC o t and SPC o T (or SPC o e and SPC o E in eshell's
case) have been reversed.

The lowercase keybind toggles the popup (and the prefix arg forciby
recreates the popup), and the uppercase keybind switches to that
terminal in the current buffer (whose prefix arg will open the terminal
in default-directory, rather than the project root).

- +{term,vterm,eshell}/open have been replaced with +X/here commands and
  are bound to SPC o T (and SPC o E in eshell's case).
- +{term,vterm,eshell}/popup* have been replaced with +x/toggle commands
  and are bound to SPC o t (and SPC o e in eshell's case).

The "toggle" behavior will do as the name implies, except will select
the popup if it is visible but unfocused.

modules/term/eshell/config.el

@@ -1,10 +1,11 @@
 ;;; term/eshell/config.el -*- lexical-binding: t; -*-
 
 ;; see:
-;;   + `+eshell/open': open in current buffer
-;;   + `+eshell/open-popup': open in a popup
-;;   + `+eshell/open-fullscreen': open eshell fullscreen (will restore window
-;;     config when quitting the last eshell buffer)
+;;   + `+eshell/here': open eshell in the current window
+;;   + `+eshell/toggle': toggles an eshell popup
+;;   + `+eshell/frame': converts the current frame into an eshell-dedicated
+;;   frame. Once the last eshell process is killed, the old frame configuration
+;;   is restored.
 
 (defvar +eshell-config-dir
   (expand-file-name "eshell/" doom-private-dir)
@@ -32,7 +33,7 @@ like fasd and bd. Note that you may overwrite these in your
 `eshell-aliases-file'. This is here to provide an alternative, elisp-centric way
 to define your aliases.
 
-You should use `det-eshell-alias!' to change this.")
+You should use `set-eshell-alias!' to change this.")
 
 ;;
 (defvar eshell-directory-name (concat doom-etc-dir "eshell"))