gears.color docs: replace literal '<' and '>' with respective HTML entities

Luadoc confuses '<stop>' with an HTML tag otherwise.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Signed-off-by: Uli Schlachter <psychon@znc.in>

lib/gears/color.lua.in

@@ -81,9 +81,9 @@ end
 
 --- Create a linear pattern object.
 -- The pattern is created from a string. This string should have the following
--- form: "x0,y0:x1,y1:<stops>"
+-- form: "x0,y0:x1,y1:&#60;stops&#62;"
 -- x0,y0 and x1,y1 are the start and stop point of the pattern.
--- For the explanation of "<stops>", see add_stops().
+-- For the explanation of "&#60;stops&#62;", see add_stops().
 -- @param arg The argument describing the pattern
 -- @return a cairo pattern object
 -- @name create_linear_pattern
@@ -91,10 +91,10 @@ end
 
 --- Create a radial pattern object.
 -- The pattern is created from a string. This string should have the following
--- form: "x0,y0,r0:x1,y1,r1:<stops>"
+-- form: "x0,y0,r0:x1,y1,r1:&#60stops&#62"
 -- x0,y0 and x1,y1 are the start and stop point of the pattern.
 -- r0 and r1 are the radii of the start / stop circle.
--- For the explanation of "<stops>", see add_stops().
+-- For the explanation of "&#60stops&#62", see add_stops().
 -- @param arg The argument describing the pattern
 -- @return a cairo pattern object
 -- @name create_radial_pattern