pacman-*: improve header descriptions (#19720)

Author: Managor

pages/linux/pacman-files.md

@@ -1,6 +1,6 @@
 # pacman --files
 
-> Arch Linux package manager utility.
+> Query the local files database.
 > See also: `pacman`, `pkgfile`.
 > More information: <https://manned.org/pacman.8>.
 

pages/linux/pacman-query.md

@@ -1,6 +1,6 @@
 # pacman --query
 
-> Arch Linux package manager utility.
+> Query the local package database.
 > See also: `pacman`.
 > More information: <https://manned.org/pacman.8>.
 

pages/linux/pacman-remove.md

@@ -1,6 +1,6 @@
 # pacman --remove
 
-> Arch Linux package manager utility.
+> Remove packages from the system.
 > See also: `pacman`.
 > More information: <https://manned.org/pacman.8>.
 

pages/linux/pacman-sync.md

@@ -1,6 +1,6 @@
 # pacman --sync
 
-> Arch Linux package manager utility.
+> Synchronize packages from remote repositories.
 > See also: `pacman`.
 > More information: <https://manned.org/pacman.8>.
 

pages/linux/pacman-upgrade.md

@@ -1,6 +1,6 @@
 # pacman --upgrade
 
-> Arch Linux package manager utility.
+> Install packages manually from archive files.
 > See also: `pacman`.
 > More information: <https://manned.org/pacman.8>.