Further peer review improvements for documentation.

certgen/README.md

@@ -261,10 +261,13 @@ Crypto Callbacks to show signing against HSM/TPM
 
 Tested with these wolfSSL build options:
 
-```
+```sh
+./autogen.sh  # If cloned from GitHub
 ./configure --enable-certreq --enable-certgen --enable-certext --enable-cryptocb
 make
+make check
 sudo make install
+sudo ldconfig # required on some targets
 ```
 
 ### `csr_cryptocb` Example output

certgen/csr_cryptocb.c

@@ -515,7 +515,7 @@ int main(int argc, char** argv)
 
     return gen_csr(argv[1]);
 #else
-    printf("Please compile wolfSSL with --enable-certreq --enable-certgen --enable-certext --enable-cryptocb\n");
+    printf("Please compile wolfSSL with `--enable-certreq --enable-certgen --enable-certext --enable-cryptocb` and RSA, ECC or ED25519\n");
     return 0;
 #endif
 }