Use `.Pq Ql'' to quote single characters, instead of `.Pq Li''.

This makes the resulting output more aesthetically pleasing in
text-only terminals:

Reviewed by:	ru

bin/sh/sh.1

@@ -98,7 +98,7 @@ generally prompts before each command and handles programming
 and command errors differently (as described below).
 When first starting, the shell inspects argument 0, and
 if it begins with a dash
-.Pq Li - ,
+.Pq Ql - ,
 the shell is also considered a login shell.
 This is normally done automatically by the system
 when the user first logs in.
@@ -172,15 +172,15 @@ built-in command
 (described later in the section called
 .Sx Built-in Commands ) .
 Introducing an option with a dash
-.Pq Li -
+.Pq Ql -
 enables the option,
 while using a plus
-.Pq Li +
+.Pq Ql +
 disables the option.
 A
 .Dq Li --
 or plain
-.Dq Li -
+.Dq Ql -
 will stop option processing and will force the remaining
 words on the command line to be treated as arguments.
 The
@@ -366,11 +366,11 @@ it impossible to put single-quotes in a single-quoted string).
 .It Double Quotes
 Enclosing characters within double quotes preserves the literal
 meaning of all characters except dollarsign
-.Pq Li $ ,
+.Pq Ql $ ,
 backquote
-.Pq Li ` ,
+.Pq Ql ` ,
 and backslash
-.Pq Li \e .
+.Pq Ql \e .
 The backslash inside double quotes is historically weird.
 It remains literal unless it precedes the following characters,
 which it serves to quote:
@@ -380,7 +380,7 @@ which it serves to quote:
 .It Backslash
 A backslash preserves the literal meaning of the following
 character, with the exception of the newline character
-.Pq Li \en .
+.Pq Ql \en .
 A backslash preceding a newline is treated as a line continuation.
 .El
 .Ss Reserved Words
@@ -703,7 +703,7 @@ They are executed in the current shell, although they do not affect its
 environment when used in pipelines.
 .Ss Background Commands (&)
 If a command is terminated by the control operator ampersand
-.Pq Li & ,
+.Pq Ql & ,
 the shell executes the command asynchronously;
 the shell does not wait for the command to finish
 before executing the next command.
@@ -1057,11 +1057,11 @@ character is used to introduce parameter expansion, command
 substitution, or arithmetic evaluation.
 .Ss Tilde Expansion (substituting a user's home directory)
 A word beginning with an unquoted tilde character
-.Pq Li ~
+.Pq Ql ~
 is
 subjected to tilde expansion.
 All the characters up to a slash
-.Pq Li /
+.Pq Ql /
 or the end of the word are treated as a username
 and are replaced with the user's home directory.
 If the
@@ -1290,13 +1290,13 @@ variable or the output of the command is scanned for these
 characters and they are turned into meta-characters.
 .Pp
 An asterisk
-.Pq Li *
+.Pq Ql *
 matches any string of characters.
 A question mark
-.Pq Li \&?
+.Pq Ql \&?
 matches any single character.
 A left bracket
-.Pq Li [
+.Pq Ql [
 introduces a character class.
 The end of the character class is indicated by a
 .Dq Li \&] ;
@@ -1310,7 +1310,7 @@ rather than introducing a character class.
 A character class matches any of the characters between the square brackets.
 A range of characters may be specified using a minus sign.
 The character class may be complemented by making an exclamation point
-.Pq Li !\&
+.Pq Ql !\&
 the first character of the character class.
 .Pp
 To include a
@@ -1853,9 +1853,9 @@ flag may be omitted when specifying arguments to be used
 as positional replacement parameters.
 This is not recommended,
 because the first argument may begin with a dash
-.Pq Li -
+.Pq Ql -
 or a plus
-.Pq Li + ,
+.Pq Ql + ,
 which the
 .Ic set
 command will interpret as a request to enable or disable options.