mouse.4: Eliminate groff "cannot adjust line" warnings

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

man4/mouse.4

@@ -90,6 +90,7 @@ two's-complement,
 .RI ( rb )
 are set when the left (right)
 button is pressed:
+.nf
 .TS
 center;
 r c c c c c c c.
@@ -98,6 +99,7 @@ byte	d6	d5	d4	d3	d2	d1	d0
 2	0	dx5	dx4	dx3	dx2	dx1	dx0
 3	0	dy5	dy4	dy3	dy2	dy1	dy0
 .TE
+.fi
 .SS 3-button Microsoft protocol
 Original Microsoft mice only have two buttons.
 However, there are some
@@ -134,6 +136,7 @@ values.
 .IR rb )
 are cleared when the left (middle,
 right) button is pressed:
+.nf
 .TS
 center;
 r c c c c c c c c.
@@ -144,6 +147,7 @@ byte	d7	d6	d5	d4	d3	d2	d1	d0
 4	0	dxb6	dxb5	dxb4	dxb3	dxb2	dxb1	dxb0
 5	0	dyb6	dyb5	dyb4	dyb3	dyb2	dyb1	dyb0
 .TE
+.fi
 
 Bytes 4 and 5 describe the change that occurred since bytes 2 and 3
 were transmitted.
@@ -169,6 +173,7 @@ sign bit indicating a negative value.
 .IR rb )
 are
 set when the left (middle, right) button is pressed:
+.nf
 .TS
 center;
 r c c c c c c c c.
@@ -177,6 +182,7 @@ byte	d7	d6	d5	d4	d3	d2	d1	d0
 2	0	dx6	dx5	dx4	dx3	dx2	dx1	dx0
 3	0	dy6	dy5	dy4	dy3	dy2	dy1	dy0
 .TE
+.fi
 .SH FILES
 .TP
 .I /dev/mouse