Merge pull request #972 from data-integrations/PLUGIN-1118

[PLUGIN-1118] Update GCS batchsource document for Enable Quoted Values.

Author: JessieYee

docs/GCSFile-batchsource.md

@@ -50,6 +50,14 @@ If the format is 'text', the schema must contain a field named 'body' of type 's
 
 **Skip Header** Whether to skip the first line of each file. Supported formats are 'text', 'csv', 'tsv', 'delimited'.
 
+**Enable Quoted Values** Whether to treat content between quotes as a value. This value will only be used if the format
+is 'csv', 'tsv' or 'delimited'. For example, if this is set to true, a line that looks like `1, "a, b, c"` will output two fields.
+The first field will have `1` as its value and the second will have `a, b, c` as its value. The quote characters will be trimmed.
+The newline delimiter cannot be within quotes.
+
+It also assumes the quotes are well enclosed. The left quote will match the first following quote right before the delimiter. If there is an
+unenclosed quote, an error will occur.
+
 **Service Account**  - service account key used for authorization
 
 * **File Path**: Path on the local file system of the service account key used for