be more specific about context and breakpoint scaling

diff --git a/docs/4.0/layout/grid.md b/docs/4.0/layout/grid.md
index 05c01d885f554e3dd598973813f41723c79f96a7..2bf3ddb0f9a0135b3b8d46d230e182efa7983d60 100644 (file)
--- a/docs/4.0/layout/grid.md
+++ b/docs/4.0/layout/grid.md
@@ -35,9 +35,9 @@ The above example creates three equal-width columns on small, medium, large, and
 Breaking it down, here's how it works:
 
 - Containers provide a means to center and horizontally pad your site's contents. Use `.container` for a responsive pixel width or `.container-fluid` for `width: 100%` across all viewport and device sizes.
-- Rows are wrappers for columns. Each column has horizontal `padding` (called a gutter) for controlling the space between them. This `padding` is then counteracted on the rows with negative margins; this way, all your content is aligned properly down the left side.
-- Content should be placed within columns, and only columns may be immediate children of rows.
-- Thanks to flexbox, grid columns without a set width will automatically layout with equal widths. For example, four instances of `.col-sm` will each automatically be 25% wide for small breakpoints.
+- Rows are wrappers for columns. Each column has horizontal `padding` (called a gutter) for controlling the space between them. This `padding` is then counteracted on the rows with negative margins. This way, all the content in your columns is visually aligned down the left side.
+- In a grid layout, content must be placed within columns and only columns may be immediate children of rows.
+- Thanks to flexbox, grid columns without a specified `width` will automatically layout as equal width columns. For example, four instances of `.col-sm` will each automatically be 25% wide from the small breakpoint and up.
 - Column classes indicate the number of columns you'd like to use out of the possible 12 per row. So, if you want three equal-width columns, you can use `.col-sm-4`.
 - Column `width`s are set in percentages, so they're always fluid and sized relative to their parent element.
 - Columns have horizontal `padding` to create the gutters between individual columns, however, you can remove the `margin` from rows and `padding` from columns with `.no-gutters` on the `.row`.