docs: curl_version_info is not thread-safe before libcurl initialization

Closes #9583

docs/libcurl/curl_version_info.3

@@ -46,6 +46,10 @@ Applications should use this information to judge if things are possible to do
 or not, instead of using compile-time checks, as dynamic/DLL libraries can be
 changed independent of applications.
 
+This function can alter the returned static data as long as
+\fIcurl_global_init\fP has not been called. It is therefore not thread-safe
+before libcurl initialization occurs.
+
 The curl_version_info_data struct looks like this
 
 .nf

docs/libcurl/libcurl-thread.3

@@ -111,3 +111,5 @@ replacements, must be thread safe. You can use \fIcurl_global_init_mem(3)\fP
 to set your own replacement memory functions.
 .IP "Non-safe functions"
 \fICURLOPT_DNS_USE_GLOBAL_CACHE(3)\fP is not thread-safe.
+
+\fIcurl_version_info(3)\fP is not thread-safe before libcurl initialization.