[css-flexbox] Fix definition of inflexibe

Author: fantasai

css-flexbox/Overview.bs

@@ -1469,7 +1469,7 @@ Flexibility</h2>
 	A flex container distributes free space to its items (proportional to their <a>flex grow factor</a>) to fill the container,
 	or shrinks them (proportional to their <a>flex shrink factor</a>) to prevent overflow.
 
-	A <a>flex item</a> is <dfn>inflexible</dfn>
+	A <a>flex item</a> is <dfn>fully inflexible</dfn>
 	if both its 'flex-grow' and 'flex-shrink' values are zero,
 	and <dfn>flexible</dfn> otherwise.
 
@@ -1616,7 +1616,7 @@ Basic Values of 'flex'</h4>
 		<dd>
 			Equivalent to ''flex: 0 0 auto''.
 			This value sizes the item according to the 'width'/'height' properties,
-			but makes the flex item fully inflexible.
+			but makes the flex item <a>fully inflexible</a>.
 			This is similar to ''initial'',
 			except that flex items are not allowed to shrink,
 			even in overflow situations.
@@ -2706,7 +2706,7 @@ Definite and Indefinite Sizes</h3>
 			definite for the purpose of layout; see <a href="#algo-stretch">step 11</a>.
 	</ol>
 
-	Note: The main size of an inflexible item with a <a>definite</a> <a>flex basis</a>
+	Note: The main size of a <a>fully inflexible</a> item with a <a>definite</a> <a>flex basis</a>
 	is, by definition, <a>definite</a>.