config.d: clarify that initial : and = might need quoting [skip ci]

Fixes #3738
Closes #3749

diff --git a/docs/cmdline-opts/config.d b/docs/cmdline-opts/config.d
index 105d628286a69b733f80640daeb1b76b87f8d92f..ef9894b8e1830200078087ba89f08b0342d8caf9 100644 (file)
--- a/docs/cmdline-opts/config.d
+++ b/docs/cmdline-opts/config.d
@@ -15,12 +15,12 @@ if so, the colon or equals characters can be used as separators. If the option
 is specified with one or two dashes, there can be no colon or equals character
 between the option and its parameter.
 
-If the parameter is to contain whitespace, the parameter must be enclosed
-within quotes. Within double quotes, the following escape sequences are
-available: \\\\, \\", \\t, \\n, \\r and \\v. A backslash preceding any other
-letter is ignored. If the first column of a config line is a '#' character,
-the rest of the line will be treated as a comment. Only write one option per
-physical line in the config file.
+If the parameter contains whitespace (or starts with : or =), the parameter
+must be enclosed within quotes. Within double quotes, the following escape
+sequences are available: \\\\, \\", \\t, \\n, \\r and \\v. A backslash
+preceding any other letter is ignored. If the first column of a config line is
+a '#' character, the rest of the line will be treated as a comment. Only write
+one option per physical line in the config file.
 
 Specify the filename to --config as '-' to make curl read the file from stdin.