Fix typo (twbs#31102)

Author: nicjohnson

site/content/docs/5.0/layout/grid.md

@@ -38,7 +38,7 @@ Breaking it down, here's how the grid system comes together:
 
 - **Our grid supports [six responsive breakpoints]({{< docsref "/layout/breakpoints" >}}).**  Breakpoints are based on `min-width` media queries, meaning they affect that breakpoint and all those above it (e.g., `.col-sm-4` applies to `sm`, `md`, `lg`, `xl`, and `xxl`). This means you can control container and column sizing and behavior by each breakpoint.
 
-- **Containers center and horizontally pad your content.** Use `.container` for a responsive pixel width, `.container-fluid` for `width: 100%` across all viewports and devices, or a responsive container (e.g., `.container-md`) fir combination of fluid and pixel widths.
+- **Containers center and horizontally pad your content.** Use `.container` for a responsive pixel width, `.container-fluid` for `width: 100%` across all viewports and devices, or a responsive container (e.g., `.container-md`) for a combination of fluid and pixel widths.
 
 - **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 to ensure the content in your columns is visually aligned down the left side. Rows also support modifier classes to [uniformly apply column sizing](#row-columns) and [gutter classes]({{< docsref "/layout/gutters" >}}) to change the spacing of your content.