LibWeb: Fix spec link in FlexFormattingContext

Author: https://github.com/Psychpsyo
Commit: https://github.com/LadybirdBrowser/ladybird/commit/e2b21157222
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2515
Reviewed-by: https://github.com/tcl3 ✅

Libraries/LibWeb/Layout/FlexFormattingContext.cpp

@@ -1201,7 +1201,7 @@ void FlexFormattingContext::calculate_cross_size_of_each_flex_line()
     }
 }
 
-// https://www.w3.org/TR/css-flexbox-1/#cross-sizing
+// https://www.w3.org/TR/css-flexbox-1/#algo-stretch
 void FlexFormattingContext::determine_used_cross_size_of_each_flex_item()
 {
     for (auto& flex_line : m_flex_lines) {