Update basic_usage.md

doc/basic_usage.md

@@ -47,7 +47,7 @@ To perform power flow analysis, call the `runPowerSAS` function as follows:
 ```Matlab
 res=runPowerSAS('pf',data,options)
 ```
-where the argument `data` can either be a string of file name or a `SysData` struct. When `data` is a string, the 
+where the argument `data` can either be a string of file name or a `SysData` struct.  
 
 Below are some examples:
 
@@ -138,4 +138,4 @@ The argument list is explained as follows:
 * `fontSize`: Font size of labels. Default value is 12.
 * `width`: Width of figure window in pixels.
 * `height`: Height of figure window in pixels.
-* `sizeRatio`: If `width` or `height` is not specified, the size of the figure is determined by the `sizeRatio` of the screen size. The default value of `sizeRatio` is 0.7.
+* `sizeRatio`: If `width` or `height` is not specified, the size of the figure is determined by the `sizeRatio` of the screen size. The default value of `sizeRatio` is 0.7.