[css-animations-1] Fix notes: these are normative statements.

Author: fantasai

css-animations-1/Overview.bs

@@ -269,7 +269,7 @@ Declaring Keyframes</h2>
 	Values less than ''0%'' or higher than ''100%'' are invalid
 	and cause their <<keyframe-block>> to be ignored.
 
-	<span class="note">Note that the percentage unit specifier must be used on percentage values. Therefore, ''0'' is an invalid keyframe selector.</span>
+	Note: Note that the percentage unit specifier must be used on percentage values. Therefore, ''0'' is an invalid keyframe selector.
 
 	If a ''0%'' or ''from'' keyframe is not specified, then the user agent constructs a ''0%'' keyframe
 	using the computed values of the properties being animated. If a ''100%'' or ''to'' keyframe is not
@@ -819,12 +819,12 @@ The 'animation' shorthand property</h3>
 
 	<span class=prod><dfn>&lt;single-animation></dfn> = <<time [0s,∞]>> || <<easing-function>> || <<time>> || <<single-animation-iteration-count>> || <<single-animation-direction>> || <<single-animation-fill-mode>> || <<single-animation-play-state>> || [ none | <<keyframes-name>> ]</span>
 
-	Note that order is important within each animation definition: the first value in each
+	Order is important within each animation definition: the first value in each
 	<<single-animation>> that can be parsed as a <<time>> is assigned to the 'animation-duration',
 	and the second value in each <<single-animation>> that can be parsed as a <<time>> is assigned to
 	'animation-delay'.
 
-	Note that order is also important within each animation definition for distinguishing
+	Order is also important within each animation definition for distinguishing
 	<<keyframes-name>> values from other keywords. When parsing, keywords that are valid for
 	properties other than 'animation-name'
 	whose values were not found earlier in the shorthand