Update src/doc/builtinplugins.rst

Co-authored-by: Brecht Van Lommel <[email protected]>
Signed-off-by: Larry Gritz <[email protected]>

src/doc/builtinplugins.rst

@@ -1756,7 +1756,7 @@ attributes are supported:
        example by reading from memory rather than the file system.
    * - ``png:linear_premult``
      - int
-     - If nonzero, will convert  or gamma-encoded values to linear color
+     - If nonzero, will convert sRGB or gamma-encoded values to linear color
        space for any premultiplication-by-alpha step done by the PNG reader.
        If zero (the default), any needed premultiplication will happen directly
        to the encoded values.