docs: Clarify OpenSSF Best Practices vs Scorecard

SECURITY.md has a recently added section titled OpenSSF Scorecard
that actually documents OpenSSF Best Practices. Scorecard [0] is a
different OpenSSF project, that incorporates Best Practices, but is
distinct in its objectives and how it achieves them.
This change clarifies the terminology, and also removes any
implication that Gold Best Practices is an award rather than a self
certification programme.
As curl was a leader in implementing Best Practices some folk may be
more familiar with the earlier Core Infrastructure Initiative (CII)
naming, so a reference to that has been added.

[0] https://scorecard.dev/

Signed-off-by: Chris Swan <[email protected]>
Ref: curl#14319
Closes curl#14635

SECURITY.md

@@ -15,13 +15,15 @@ libcurl, report it on [HackerOne](https://hackerone.com/curl).
 
 We treat security issues with confidentiality until controlled and disclosed responsibly.
 
-## OpenSSF Scorecard
-
-curl has earned Gold status on the OpenSSF Best Practices, reflecting its adherence to
-rigorous security and best practice standards. This achievement highlights curl's
-comprehensive documentation, secure development processes, effective change control
-mechanisms, and strong maintenance routines. Meeting these criteria demonstrates curl's
-commitment to security and reliability, ensuring the project's sustainability and
-trustworthiness. This recognition by OpenSSF underscores curl's role as a leader in
-open-source software practices. More information can be found on
-their [OpenSSF page](https://www.bestpractices.dev/projects/63).
+## OpenSSF Best Practices
+
+curl has achieved Gold status on the Open Source Security Foundation (OpenSSF)
+[Best Practices](https://bestpractices.dev/) (formerly Core Infrastructure
+Initiative Best Practices), reflecting its adherence to rigorous
+security and best practice standards. This achievement highlights curl's
+comprehensive documentation, secure development processes, effective change
+control mechanisms, and strong maintenance routines. Meeting these criteria
+demonstrates curl's commitment to security and reliability, ensuring the
+project's sustainability and trustworthiness. This underscores curl's role as
+a leader in open-source software practices. More information can be found on
+[curl's OpenSSF Best Practices project page](https://www.bestpractices.dev/projects/63).