Correct sampling param error in DXIL docs

The documentation for sample incorrectly implied that textureCUBE
resources should have 3 active offsets. Actually, cube textures have no
sample method overloads that include offsets.

This corrects the table indicating the number of active elements for
sample and also for sampleGrad as it incorrectly stated that the number
of active gradients is the same as the number of offsets. Again for cube
textures this is inaccurate. Cube textures take 3 gradients, but still
allow no active offsets.

docs/DXIL.rst

@@ -1411,8 +1411,8 @@ Texture1DArray      2 (c0, c1 = array slice)         1 (o0)
 Texture2D           2 (c0, c1)                       2 (o0, o1)
 Texture2DArray      3 (c0, c1, c2 = array slice)     2 (o0, o1)
 Texture3D           3 (c0, c1, c2)                   3 (o0, o1, o2)
-TextureCUBE         3 (c0, c1, c2)                   3 (o0, o1, o2)
-TextureCUBEArray    4 (c0, c1, c2, c3 = array slice) 3 (o0, o1, o2)
+TextureCUBE         3 (c0, c1, c2)                   0
+TextureCUBEArray    4 (c0, c1, c2, c3 = array slice) 0
 =================== ================================ ===================
 
 SampleBias
@@ -1435,7 +1435,7 @@ The following signature shows the operation syntax::
       float,                ; bias: in [-16.f,15.99f]
       float)                ; clamp
 
-Valid resource types and active components/offsets are the same as for the sample operation.
+Valid resource types and active coordinates/offsets are the same as for the sample operation.
 
 SampleLevel
 ~~~~~~~~~~~
@@ -1456,7 +1456,7 @@ The following signature shows the operation syntax::
       i32,                  ; offset o2
       float)                ; LOD
 
-Valid resource types and active components/offsets are the same as for the sample operation.
+Valid resource types and active coordinates/offsets are the same as for the sample operation.
 
 SampleGrad
 ~~~~~~~~~~
@@ -1483,7 +1483,17 @@ The following signature shows the operation syntax::
       float,                ; ddy2
       float)                ; clamp
 
-Valid resource types and active components and offsets are the same as for the sample operation. Valid active ddx and ddy are   the same as offsets.
+=================== ================================ =================== ====================================
+Valid resource type # of active coordinates          # of active offsets # of active gradients
+=================== ================================ =================== ====================================
+Texture1D           1 (c0)                           1 (o0)               1 (ddx0/ddy0)
+Texture1DArray      2 (c0, c1 = array slice)         1 (o0)               1 (ddx0/ddy0)
+Texture2D           2 (c0, c1)                       2 (o0, o1)           2 (ddx0/ddy0, ddx1/ddy1)
+Texture2DArray      3 (c0, c1, c2 = array slice)     2 (o0, o1)           2 (ddx0/ddy0, ddx1/ddy1)
+Texture3D           3 (c0, c1, c2)                   3 (o0, o1, o2)       3 (ddx0/ddy0, ddx1/ddy1, ddx2,ddy2)
+TextureCUBE         3 (c0, c1, c2)                   0                    3 (ddx0/ddy0, ddx1/ddy1, ddx2,ddy2)
+TextureCUBEArray    4 (c0, c1, c2, c3 = array slice) 0                    3 (ddx0/ddy0, ddx1/ddy1, ddx2,ddy2)
+=================== ================================ =================== ====================================
 
 SampleCmp
 ~~~~~~~~~
@@ -1512,8 +1522,8 @@ Texture1D           1 (c0)                           1 (o0)
 Texture1DArray      2 (c0, c1 = array slice)         1 (o0)
 Texture2D           2 (c0, c1)                       2 (o0, o1)
 Texture2DArray      3 (c0, c1, c2 = array slice)     2 (o0, o1)
-TextureCUBE         3 (c0, c1, c2)                   3 (o0, o1, o2)
-TextureCUBEArray    4 (c0, c1, c2, c3 = array slice) 3 (o0, o1, o2)
+TextureCUBE         3 (c0, c1, c2)                   0
+TextureCUBEArray    4 (c0, c1, c2, c3 = array slice) 0
 =================== ================================ ===================
 
 SampleCmpLevelZero
@@ -1535,7 +1545,7 @@ The following signature shows the operation syntax::
       i32,                  ; offset o2
       float)                ; compare value
 
-Valid resource types and active components/offsets are the same as for the sampleCmp operation.
+Valid resource types and active coordinates/offsets are the same as for the sampleCmp operation.
 
 TextureLoad
 ~~~~~~~~~~~
@@ -1679,7 +1689,7 @@ The following signature shows the operation syntax::
       i32,                  ; channel, constant in {0=red,1=green,2=blue,3=alpha}
       float)                ; compare value
 
-Valid resource types and active components/offsets are the same as for the textureGather operation.
+Valid resource types and active coordinates/offsets are the same as for the textureGather operation.
 
 Texture2DMSGetSamplePosition
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~