[css-flexbox] Fix Tab's 'typo'.

Author: fantasai

css-flexbox/Overview.html

@@ -2088,7 +2088,7 @@ <h3 class="heading settled heading" data-level=9.2 id=line-sizing><span class=se
 					using its <a data-link-type=dfn href=#flex-basis title="flex basis">flex basis</a> in place of its <a data-link-type=dfn href=#main-size title="main size">main size</a>,
 					treating a <a data-link-type=dfn href=#main-size title="main size">main size</a> of <a class=css-code data-link-for=width data-link-type=value title=auto>auto</a> as <span class=css data-link-type=maybe title=max-content>max-content</span>.
 					If a <a data-link-type=dfn href=#cross-size title="cross size">cross size</a> is needed to determine the <a data-link-type=dfn href=#main-size title="main size">main size</a>
-					(e.g. when the <a data-link-type=dfn href=#flex-item title="flex item">flex item</a>’s <a data-link-type=dfn href=#main-size title="main size">main size</a> is in it’s block axis)
+					(e.g. when the <a data-link-type=dfn href=#flex-item title="flex item">flex item</a>’s <a data-link-type=dfn href=#main-size title="main size">main size</a> is in its block axis)
 					and the <a data-link-type=dfn href=#flex-item title="flex item">flex item</a>’s cross size is <a class=css data-link-type=maybe href=#valuedef-auto0 title=auto>auto</a> and not <a data-link-type=dfn href=#definite title=definite>definite</a>,
 					in this calculation use <span class=css data-link-type=maybe title=fit-content>fit-content</span> as the <a data-link-type=dfn href=#flex-item title="flex item">flex item</a>’s <a data-link-type=dfn href=#cross-size title="cross size">cross size</a>.
 					The <a data-link-type=dfn href=#flex-base-size title="flex base size">flex base size</a> is the item’s resulting <a data-link-type=dfn href=#main-size title="main size">main size</a>.

css-flexbox/Overview.src.html

@@ -2075,7 +2075,7 @@ <h3 id='line-sizing'>
 					using its <i>flex basis</i> in place of its <i>main size</i>,
 					treating a <i>main size</i> of <a value for=width>auto</a> as ''max-content''.
 					If a <i>cross size</i> is needed to determine the <i>main size</i>
-					(e.g. when the <i>flex item</i>’s <i>main size</i> is in it’s block axis)
+					(e.g. when the <i>flex item</i>’s <i>main size</i> is in its block axis)
 					and the <i>flex item</i>’s cross size is ''auto'' and not <i>definite</i>,
 					in this calculation use ''fit-content'' as the <i>flex item</i>’s <i>cross size</i>.
 					The <i>flex base size</i> is the item's resulting <i>main size</i>.