Clarified signed normalized texture types, formatting fixes.

Signed normalization results in [-1.0, 1.0], NOT [0.0, 1.0].

src/AbstractTexture.h

@@ -147,85 +147,75 @@ class MAGNUM_EXPORT AbstractTexture {
         enum class ComponentType {
             /**
              * (Non-normalized) unsigned byte
-             *
              * @requires_gl30 Extension @extension{EXT,texture_integer}
              */
             UnsignedByte,
 
             /**
              * (Non-normalized) byte
-             *
              * @requires_gl30 Extension @extension{EXT,texture_integer}
              */
             Byte,
 
             /**
              * (Non-normalized) unsigned short
-             *
              * @requires_gl30 Extension @extension{EXT,texture_integer}
              */
             UnsignedShort,
 
             /**
              * (Non-normalized) short
-             *
              * @requires_gl30 Extension @extension{EXT,texture_integer}
              */
             Short,
 
             /**
              * (Non-normalized) unsigned integer
-             *
              * @requires_gl30 Extension @extension{EXT,texture_integer}
              */
             UnsignedInt,
 
             /**
              * (Non-normalized) integer
-             *
              * @requires_gl30 Extension @extension{EXT,texture_integer}
              */
             Int,
 
             /**
              * Half float (16 bit)
-             *
              * @requires_gl30 Extension @extension{ARB,texture_float}
              */
             Half,
 
             /**
              * Float (32 bit)
-             *
              * @requires_gl30 Extension @extension{ARB,texture_float}
              */
             Float,
 
             /**
-             * Normalized unsigned byte, i.e. values from range
-             * @f$ [0; 255] @f$ are converted to range @f$ [0.0; 1.0] @f$.
+             * Normalized unsigned byte, i.e. values from range @f$ [0; 255] @f$
+             * are converted to range @f$ [0.0; 1.0] @f$.
              */
             NormalizedUnsignedByte,
 
             /**
-             * Normalized byte, i.e. values from range
-             * @f$ [-128; 127] @f$ are converted to range @f$ [0.0; 1.0] @f$.
-             *
-             * @requires_gl31 (no extension providing this functionality)
+             * Normalized signed byte, i.e. values from range @f$ [-128; 127] @f$
+             * are converted to range @f$ [-1.0; 1.0] @f$.
+             * @requires_gl31 Extension @extension{EXT,texture_snorm}
              */
             NormalizedByte,
 
             /**
-             * Normalized unsigned short, i.e. values from range
-             * @f$ [0; 65536] @f$ are converted to range @f$ [0.0; 1.0] @f$.
+             * Normalized unsigned short, i.e. values from range @f$ [0; 65536] @f$
+             * are converted to range @f$ [0.0; 1.0] @f$.
              */
             NormalizedUnsignedShort,
 
             /**
-             * Normalized short, i.e. values from range
-             * @f$ [-32768; 32767] @f$ are converted to range @f$ [0.0; 1.0] @f$.
-             *
-             * @requires_gl31 (no extension providing this functionality)
+             * Normalized signed short, i.e. values from range @f$ [-32768; 32767] @f$
+             * are converted to range @f$ [-1.0; 1.0] @f$.
+             * @requires_gl31 Extension @extension{EXT,texture_snorm}
              */
             NormalizedShort
         };