pacman-t: add alias page; pacman-deptest: update page (#15178)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/linux/pacman-de.md

@@ -0,0 +1,7 @@
+# pacman -T
+
+> This command is an alias of `pacman --deptest`.
+
+- View documentation for the original command:
+
+`tldr pacman deptest`

pages/linux/pacman-deptest.md

@@ -4,18 +4,18 @@
 > See also: `pacman`.
 > More information: <https://manned.org/pacman.8>.
 
-- Print the package names of the dependencies that aren't installed:
+- Print the package names of the dependencies that are not installed:
 
-`pacman --deptest {{package1 package2 ...}}`
+`pacman -T {{package1 package2 ...}}`
 
 - Check if the installed package satisfies the given minimum version:
 
-`pacman --deptest "{{bash>=5}}"`
+`pacman -T "{{bash>=5}}"`
 
 - Check if a later version of a package is installed:
 
-`pacman --deptest "{{bash>5}}"`
+`pacman -T "{{bash>5}}"`
 
 - Display help:
 
-`pacman --deptest --help`
+`pacman -T --help`