doc: Properly close sentences ending with an upper-case letter.

* doc/guix.texi (Application Setup):
(USB Stick and DVD Installation):
(Proxy Settings):
(Primary URL):
(origin Reference):
(Build Systems):
(The Store):
(Package Transformation Options):
(Invoking guix lint):
(Invoking guix graph):
(operating-system Reference):
(X Window):
(Desktop Services):
(Database Services):
(Mail Services):
(Messaging Services):
(Monitoring Services):
(LDAP Services):
(Certificate Services):
(DNS Services):
(VPN Services):
(Power Management Services):
(Virtualization Services):
(Version Control Services):
(Name Service Switch):
(Bootloader Configuration):
(Running Guix in a VM):
(Separate Debug Info): Use "@." to indicate to Texinfo the sentence does end
with a capital letter.

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