dir_colors.5: Use table markup for better HTML rendering

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man5/dir_colors.5

@@ -192,30 +192,30 @@ ISO 6429 color sequences are composed of sequences of numbers
 separated by semicolons.
 The most common codes are:
 .sp
-.RS +.2i
-.ta 1.0i
-.nf
- 0     to restore default color
- 1     for brighter colors
- 4     for underlined text
- 5     for flashing text
-30     for black foreground
-31     for red foreground
-32     for green foreground
-33     for yellow (or brown) foreground
-34     for blue foreground
-35     for purple foreground
-36     for cyan foreground
-37     for white (or gray) foreground
-40     for black background
-41     for red background
-42     for green background
-43     for yellow (or brown) background
-44     for blue background
-45     for purple background
-46     for cyan background
-47     for white (or gray) background
-.fi
+.RS
+.TS
+l l.
+ 0	to restore default color
+ 1	for brighter colors
+ 4	for underlined text
+ 5	for flashing text
+30	for black foreground
+31	for red foreground
+32	for green foreground
+33	for yellow (or brown) foreground
+34	for blue foreground
+35	for purple foreground
+36	for cyan foreground
+37	for white (or gray) foreground
+40	for black background
+41	for red background
+42	for green background
+43	for yellow (or brown) background
+44	for blue background
+45	for purple background
+46	for cyan background
+47	for white (or gray) background
+.TE
 .RE
 .sp
 Not all commands will work on all systems or display devices.
@@ -223,22 +223,20 @@ Not all commands will work on all systems or display devices.
 .B ls
 uses the following defaults:
 .sp
-.RS +.2i
-.ta 1.0i 2.5i
-.nf
-\fBNORMAL\fR   0       Normal (nonfilename) text
-\fBFILE\fR     0       Regular file
-\fBDIR\fR      32      Directory
-\fBLINK\fR     36      Symbolic link
-\fBORPHAN\fR   undefined       Orphaned symbolic link
-\fBMISSING\fR  undefined       Missing file
-\fBFIFO\fR     31      Named pipe (FIFO)
-\fBSOCK\fR     33      Socket
-\fBBLK\fR      44;37   Block device
-\fBCHR\fR      44;37   Character device
-\fBEXEC\fR     35      Executable file
-.fi
-.RE
+.TS
+lb l l.
+NORMAL	0       	Normal (nonfilename) text
+FILE	0       	Regular file
+DIR	32      	Directory
+LINK	36      	Symbolic link
+ORPHAN	undefined	Orphaned symbolic link
+MISSING	undefined	Missing file
+FIFO	31      	Named pipe (FIFO)
+SOCK	33      	Socket
+BLK	44;37   	Block device
+CHR	44;37   	Character device
+EXEC	35      	Executable file
+.TE
 .sp
 A few terminal programs do not recognize the default
 properly.
@@ -303,25 +301,25 @@ filename extensions, either C-style \e-escaped notation or
 The C-style notation
 includes the following characters:
 .sp
-.RS +.2i
-.ta 1.0i
-.nf
-\fB\ea\fR      Bell (ASCII 7)
-\fB\eb\fR      Backspace (ASCII 8)
-\fB\ee\fR      Escape (ASCII 27)
-\fB\ef\fR      Form feed (ASCII 12)
-\fB\en\fR      Newline (ASCII 10)
-\fB\er\fR      Carriage Return (ASCII 13)
-\fB\et\fR      Tab (ASCII 9)
-\fB\ev\fR      Vertical Tab (ASCII 11)
-\fB\e?\fR      Delete (ASCII 127)
-\fB\e\fInnn\fR Any character (octal notation)
-\fB\ex\fInnn\fR        Any character (hexadecimal notation)
-\fB\e_\fR      Space
-\fB\e\e\fR     Backslash (\e)
-\fB\e^\fR      Caret (^)
-\fB\e#\fR      Hash mark (#)
-.fi
+.RS
+.TS
+lb l.
+\ea	Bell (ASCII 7)
+\eb	Backspace (ASCII 8)
+\ee	Escape (ASCII 27)
+\ef	Form feed (ASCII 12)
+\en	Newline (ASCII 10)
+\er	Carriage Return (ASCII 13)
+\et	Tab (ASCII 9)
+\ev	Vertical Tab (ASCII 11)
+\e?	Delete (ASCII 127)
+\e\fInnn	Any character (octal notation)
+\ex\fInnn	Any character (hexadecimal notation)
+\e_	Space
+\e\e	Backslash (\e)
+\e^	Caret (^)
+\e#	Hash mark (#)
+.TE
 .RE
 .sp
 Please note that escapes are necessary to enter a space, backslash,
@@ -346,12 +344,12 @@ and
 .B RIGHTCODE
 definitions, which are used by ISO 6429 terminals are:
 .sp
-.RS +.2i
-.ta 1.0i
-.nf
-\fBLEFTCODE\fR  \ee[
-\fBRIGHTCODE\fR m
-.fi
+.RS
+.TS
+lb l.
+LEFTCODE	\ee[
+RIGHTCODE	m
+.TE
 .RE
 .sp
 The default