dateTimeAs arg, invalid quoting works anyway examples

Author: Toby Dylan Hocking

vignettes/datatable-fread-and-fwrite.Rmd

@@ -195,11 +195,19 @@ Use `skip="string"` in `fread` to search for a line containing a substring (typi
 
 Supported Scenarios:
 - Unescaped quotes inside quoted fields
-e.g., `"This "quote" is invalid"` — supported as long as column count remains consistent.
+e.g., `"This "quote" is invalid, but fread works anyway"` — supported as long as column count remains consistent.
+
+```{r}
+data.table::fread(text='x,y\n"This "quote" is invalid, but fread works anyway",1')
+```
 
 - Unquoted fields that begin with quotes
 e.g., `Invalid"Field,10,20` — recognized correctly as not a quoted field.
 
+```{r}
+data.table::fread(text='x,y\nNot"Valid,1')
+```
+
 Requirements & Limitations:
 - Escaping rules and column counts must be consistent throughout the file.
 
@@ -232,7 +240,7 @@ fwrite(dt_quoting_scenario, temp_quote_adv)
 cat(readLines(temp_quote_adv), sep = "\n")
 ```
 
-### 2.2 Fine-Grained Date/Time Serialization (dateTimeAs)
+### 2.2 Fine-Grained Date/Time Serialization (`dateTimeAs` argument)
 
 Offers precise control for POSIXct/Date types: