cleanup tabs/space to silence bikeshed

Author: svgeesus

compositing-1/Overview.bs

@@ -1135,7 +1135,7 @@ In practice, this is usually all performed in one step.
 The "mixing" formula is defined as:
 
 <pre>
-	Cm = B(Cb, Cs)
+    Cm = B(Cb, Cs)
 </pre>
 
 with:
@@ -1154,7 +1154,7 @@ A transparent backdrop will cause the final result to be a weighted average betw
 The value of the new color  becomes:
 
 <pre>
-	Cr = (1 - αb) x Cs + αb x B(Cb, Cs)
+    Cr = (1 - αb) x Cs + αb x B(Cb, Cs)
 </pre>
 
 with:
@@ -1183,9 +1183,9 @@ Note how the top rectangle shifts more toward red as the opacity of the <a>backd
 Note: The following formula gives the color value in the area where the source and backdrop intersects and then composites with the specified Porter Duff compositing formula. For simple alpha blending, the formula thus becomes:
 <pre>
 simple alpha compositing:
-	co = cs + cb x (1 - αs)
+    co = cs + cb x (1 - αs)
 written as non-premultiplied:
-	αo x Co = αs x Cs + (1 - αs) x αb x Cb
+    αo x Co = αs x Cs + (1 - αs) x αb x Cb
 now substitute the result of blending for Cs:
     αo x Co = αs x ((1 - αb) x Cs + αb x B(Cb, Cs)) + (1 - αs) x αb x Cb
             = αs x (1 - αb) x Cs + αs x αb x B(Cb, Cs) + (1 - αs) x αb x Cb
@@ -1448,7 +1448,7 @@ components having the minimum, middle, and maximum values upon entry to the func
 Creates a color with the hue of the source color and the saturation and luminosity of the <a>backdrop</a> color.
 
 <pre>
-	B(Cb, Cs) = SetLum(SetSat(Cs, Sat(Cb)), Lum(Cb))
+    B(Cb, Cs) = SetLum(SetSat(Cs, Sat(Cb)), Lum(Cb))
 </pre>
 <div class="figure">
   <img src="examples/hue.png" alt="example of hue blending">
@@ -1460,7 +1460,7 @@ Creates a color with the hue of the source color and the saturation and luminosi
 Creates a color with the saturation of the source color and the hue and luminosity of the <a>backdrop</a> color. Painting with this mode in an area of the <a>backdrop</a> that is a pure gray (no saturation) produces no change.
 
 <pre>
-	B(Cb, Cs) = SetLum(SetSat(Cb, Sat(Cs)), Lum(Cb))
+    B(Cb, Cs) = SetLum(SetSat(Cb, Sat(Cs)), Lum(Cb))
 </pre>
 <div class="figure">
   <img src="examples/saturation.png" alt="example of saturation blending">
@@ -1472,7 +1472,7 @@ Creates a color with the saturation of the source color and the hue and luminosi
 Creates a color with the hue and saturation of the source color and the luminosity of the <a>backdrop</a> color. This preserves the gray levels of the <a>backdrop</a> and is useful for coloring monochrome images or tinting color images.
 
 <pre>
-	B(Cb, Cs) = SetLum(Cs, Lum(Cb))
+    B(Cb, Cs) = SetLum(Cs, Lum(Cb))
 </pre>
 <div class="figure">
   <img src="examples/color.png" alt="example of color blending">
@@ -1483,7 +1483,7 @@ Creates a color with the hue and saturation of the source color and the luminosi
 
 Creates a color with the luminosity of the source color and the hue and saturation of the <a>backdrop</a> color. This produces an inverse effect to that of the Color mode.
 <pre>
-	B(Cb, Cs) = SetLum(Cb, Lum(Cs))
+    B(Cb, Cs) = SetLum(Cb, Lum(Cs))
 </pre>
 <div class="figure">
   <img src="examples/luminosity.png" alt="example of luminosity blending">