Minor Documentation Clarifications (#3199)

Clarify PEM acronym.
The "public key" goes to the .crt file, not "public pair".

tutorials/networking/ssl_certificates.rst

@@ -19,7 +19,7 @@ specified in the project settings:
 .. image:: img/ssl_certs.png
 
 This file should contain any number of public certificates in
-https://en.wikipedia.org/wiki/Privacy-enhanced_Electronic_Mail format.
+`PEM format <https://en.wikipedia.org/wiki/Privacy-enhanced_Electronic_Mail>`__.
 
 Of course, remember to add .crt as filter so the exporter recognizes
 this when exporting your project.
@@ -32,8 +32,8 @@ Approach 1: self signed cert
 ----------------------------
 
 The first approach is the simplest: generate a private and public
-key pair, and put the public pair in the .crt file (again, in PEM
-format). The private key should go to your server.
+key pair and add the public key (in PEM format) to the .crt file.
+The private key should go to your server.
 
 OpenSSL has `some
 documentation <https://raw.githubusercontent.com/openssl/openssl/master/doc/HOWTO/keys.txt>`__ about