Fix some typos.

* doc/guix.texi (Sound Services, DNS Services): Fix typos.
* gnu/packages/cpp.scm (json-modern-cxx)[description]: Likewise.
* gnu/packages/emacs.scm (emacs-fancy-narrow)[synopsis, description]:
Likewise. Edit & mark up while we're here.
* gnu/packages/mail.scm (alot)[synopsis, description]: Ditto.

doc/guix.texi

@@ -13539,7 +13539,7 @@ Users need to be in the @code{lp} group to access the D-Bus service.
 
 The @code{(gnu services sound)} module provides a service to configure the
 Advanced Linux Sound Architecture (ALSA) system, which making PulseAudio the
-prefered ALSA output driver.
+preferred ALSA output driver.
 
 @deffn {Scheme Variable} alsa-service-type
 This is the type for the @uref{https://alsa-project.org/, Advanced Linux Sound
@@ -17425,7 +17425,7 @@ When true, don't read the hostnames in /etc/hosts.
 
 @item @code{port} (default: @code{53})
 The port to listen on.  Setting this to zero completely disables DNS
-funtion, leaving only DHCP and/or TFTP.
+responses, leaving only DHCP and/or TFTP functions.
 
 @item @code{local-service?} (default: @code{#t})
 Accept DNS queries only from hosts whose address is on a local subnet,

gnu/packages/cpp.scm

@@ -236,7 +236,7 @@ as ordering relation.")
     (build-system cmake-build-system)
     (synopsis "JSON parser and printer library for C++")
     (description "JSON for Modern C++ is a C++ JSON library that provides
-intutive syntax and trivial integration.")
+intuitive syntax and trivial integration.")
     (license license:expat)))
 
 (define-public xtl

gnu/packages/emacs.scm

@@ -9567,11 +9567,12 @@ duplicate hook and function names further into a single declarative call.")
          "0rf2rnzg82pdqch041yyx3f9ddixffkk9s2ydzg8hwy66sg3385n"))))
     (build-system emacs-build-system)
     (home-page "https://github.com/Malabarba/fancy-narrow/releases")
-    (synopsis "Immitate narrow-to-region with more eye-candy")
+    (synopsis "Imitate @code{narrow-to-region} with more eye candy")
-    (description "Unlike narrow-to-region, which completely hides text outside
+    (description
-the narrowed region, this package simply deemphasizes the text, makes it
+     "Unlike @code{narrow-to-region}, which completely hides text outside
-readonly, and makes it unreachable.  This leads to a much more natural
+the narrowed region, this package simply de-emphasizes the text, makes it
-feeling, where the region stays static (instead of being brutally moved to a
+read-only, and makes it unreachable.  This leads to a much more natural
+feeling where the region stays static (instead of being brutally moved to a
 blank slate) and is clearly highlighted with respect to the rest of the
 buffer.")
     (license license:gpl2+)))

gnu/packages/mail.scm

@@ -706,9 +706,9 @@ attachments, create new maildirs, and so on.")
        ("python2-pygpgme" ,python2-pygpgme)
        ("python2-notmuch" ,python2-notmuch)))
     (home-page "https://github.com/pazz/alot")
-    (synopsis "Commandline MUA using notmuch")
+    (synopsis "Command-line MUA using @code{notmuch}")
     (description
-     "Alot is an experimental terminal mail user agent (MUA) based on
+     "Alot is an experimental terminal mail user agent (@dfn{MUA}) based on
 @code{notmuch} mail.  It is written in Python using the @code{urwid} toolkit.")
     (license gpl3+)))