correct mandoc error: unterminated quoted argument
.PP
Example:
.PD 0
-.IP ":set auto-response-header=* Content-security-policy=default-src 'self' 'unsafe-inline' 'unsafe-eval'; script-src 'none'
-.IP ":set auto-response-header+=https://example.com/* Content-security-policy=default-src 'self' https://*.example.com/
-.IP ":set auto-response-header+=https://example.com/* Strict-Transport-Security=max-age=31536000
+.IP ":set auto-response-header=* Content-security-policy=default-src 'self' 'unsafe-inline' 'unsafe-eval'; script-src 'none'"
+.IP ":set auto-response-header+=https://example.com/* Content-security-policy=default-src 'self' https://*.example.com/"
+.IP ":set auto-response-header+=https://example.com/* Strict-Transport-Security=max-age=31536000"
.PD
.RE
.TP