Fix README typo

Author: japhb

README.md

@@ -76,7 +76,7 @@ Notice how glyph sizes become inconsistent, several glyphs (including most of th
 
 As font problems go, this is pretty minor however.  There's even a benefit: this is the first screenshot that shows programming ligatures working (see the row of glyphs just above the emoji faces).
 
-For a whole different scale of font problems, consider `xterm` for example. By default on my Linux system if you just run `xterm`, it will use a low-res `bitmap` "fixed" font with approximately Unicode 3.0 support:
+For a whole different scale of font problems, consider `xterm` for example. By default on my Linux system if you just run `xterm`, it will use a low-res **bitmap** "fixed" font with approximately Unicode 3.0 support:
 
 ![Screenshot of quick test running on xterm using the Unicode fixed font](docs/images/quick-test-xterm-fixed-unicode-ruler.png)
 

lib/Terminal/Tests.rakumod

@@ -135,7 +135,7 @@ row of glyphs just above the emoji faces).
 
 For a whole different scale of font problems, consider C<xterm> for example.
 By default on my Linux system if you just run C<xterm>, it will use a low-res
-C<bitmap> "fixed" font with approximately Unicode 3.0 support:
+B<bitmap> "fixed" font with approximately Unicode 3.0 support:
 
 L<Screenshot of quick test running on xterm using the Unicode fixed font|docs/images/quick-test-xterm-fixed-unicode-ruler.png>