tweak formatting

Author: teunbrand

NEWS.md

@@ -1,9 +1,9 @@
 # ggplot2 (development version)
 
 * `guide_*()` can now accept two inside legend theme elements:
-  "legend.position.inside" and "legend.justification.inside", allowing inside
+  `legend.position.inside` and `legend.justification.inside`, allowing inside
   legends to be placed at different positions. Only inside legends with the same
-  position and justification will be merged. (@Yunuuuu, #6210)
+  position and justification will be merged (@Yunuuuu, #6210).
 * New stat: `stat_manual()` for arbitrary computations (@teunbrand, #3501)
 * Reversal of a dimension, typically 'x' or 'y', is now controlled by the 
   `reverse` argument in `coord_cartesian()`, `coord_fixed()`, `coord_radial()`