pages*: make "See also" conform to the new syntax (#12756) (#12354)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: spageektti <git@spageektti.cc>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/age.md

@@ -1,7 +1,7 @@
 # age
 
 > A simple, modern and secure file encryption tool.
-> See `age-keygen` for how to generate key pairs.
+> See also: `age-keygen` for generating key pairs.
 > More information: <https://github.com/FiloSottile/age>.
 
 - Generate an encrypted file that can be decrypted with a passphrase: