Fix README/docs formatting

Author: hugetim

README.md

@@ -41,11 +41,13 @@ which is needlessly clunky if you are working primarily with Stata).
   code](https://quarto.org/docs/computations/inline-code.html) support
 
 Users of Stata 17 or 18.0 also get these features only built-in natively
-to Stata 18.5+: - Displays Stata output without the redundant ‘echo’ of
-(multi-line) commands - Autocompletion for variables, macros, matrices,
-and file paths - Interactive/richtext help files accessible within
-notebook - `#delimit ;` interactive support (along with all types of
-comments)
+to Stata 18.5+:
+
+- Displays Stata output without the redundant ‘echo’ of (multi-line)
+  commands
+- Autocompletion for variables, macros, matrices, and file paths
+- Interactive/richtext help files accessible within notebook
+- `#delimit ;` interactive support (along with all types of comments)
 
 The video below demonstrates using Stata in a Jupyter notebook. In
 addition to the

nbs/index.ipynb

@@ -56,6 +56,7 @@
     "- [x] Quarto [inline code](https://quarto.org/docs/computations/inline-code.html) support\n",
     "\n",
     "Users of Stata 17 or 18.0 also get these features only built-in natively to Stata 18.5+:\n",
+    "\n",
     "- Displays Stata output without the redundant 'echo' of (multi-line) commands\n",
     "- Autocompletion for variables, macros, matrices, and file paths\n",
     "- Interactive/richtext help files accessible within notebook\n",

nbs/user_guide.ipynb

@@ -120,7 +120,7 @@
     "- `graph_width`/`graph_height`: By default, graphs are generated with width 5.5in and height 4in. The width or height may be specified as a number (interpreted as inches) or a number and its unit (in, cm, or px). So `3` and `3in` are equivalent. Other valid examples: `300px` and `7.2 cm`. (Note: These values may also be set to `default`, which values alone enable the `xsize` and `ysize` options on Stata graph commands to influence the graph output size. Any values other than `default` override the `xsize` and `ysize` options.)\n",
     "- `echo`: controls the echo of commands, with the default being 'None':\n",
     "    - 'True': echo all commands. \n",
-    "    - 'False': for Stata 18.5+, not echo any command (native Stata implementation); otherwise echo (only) multi-line commands.\n",
+    "    - 'False': for Stata 18.5+, not echo any command (native Stata implementation); otherwise echo only multi-line commands.\n",
     "    - 'None': not echo any command (custom nbstata implementation). \n",
     "- `missing`: What to display for a missing value in the output of the `%browse`, `%head`, and `%tail` magics. Default is '.', following Stata. To defer to pandas's format for `NaN`, specify 'pandas'.\n",
     "- `browse_auto_height`: Whether to set 'height: 100%' for the [%browse](#browse-head-tail-and-frame-equivalents) widget (default: 'True'):\n",