Remove stray -modulus option from the ec manual page.

Reviewed-by: NPaul Yang <yang.yang@baishancloud.com>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8082)

(cherry picked from commit d7bcbfd0828616f33008e711eabc6ec00b32e87b)

doc/man1/ec.pod

@@ -101,10 +101,6 @@ Prints out the public, private key components and parameters.
 
 This option prevents output of the encoded version of the key.
 
-=item B<-modulus>
-
-This option prints out the value of the public key component of the key.
-
 =item B<-pubin>
 
 By default, a private key is read from the input file. With this option a