package/p7zip: update help text of 7za and 7zr

Update help text of 7za and 7zr options (added in commit
c1723424b8189730087006fc879fdae0cc123ca1) as suggested by Peter
Korsgaard in
https://patchwork.ozlabs.org/project/buildroot/patch/20211025215520.3712974-1-fontaine.fabrice@gmail.com/

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/p7zip/Config.in

@@ -21,14 +21,14 @@ choice
 config BR2_PACKAGE_P7ZIP_7ZA
 	bool "7za"
 	help
-	  Stand-alone executable that handles fewer archive formats
-	  than 7z
+	  Full 7za archiver. The program supports 7z, ZIP, CAB, ARJ,
+	  GZIP, BZIP2, TAR, CPIO, RPM and DEB formats
 
 config BR2_PACKAGE_P7ZIP_7ZR
 	bool "7zr"
 	help
-	  Stand-alone executable which is a "light-version" of 7za that
-	  only handles 7z archives and cannot handle encrypted archives
+	  Lightweight 7zr archiver. The program only handles 7z archives
+	  and cannot handle encrypted archives
 
 endchoice