Rename build log property

Rename the property that saves the build log, and clarify that the
property does not provide a log for a failing build.

Author: gmlueck

sycl/doc/extensions/proposed/sycl_ext_oneapi_kernel_compiler.asciidoc

@@ -266,11 +266,20 @@ _Throws:_
 
 * An `exception` with the `errc::build` error code if the compilation or
   linking operations fail.
-  In this case, the exception `what` string contains a description of the
-  error.
+  In this case, the exception `what` string provides a full build log,
+  including descriptions of any errors, warning messages, and other
+  diagnostics.
   This string is intended for human consumption, and the format may not be
   stable across implementations of this extension.
 
+[NOTE]
+====
+An uncaught `errc::build` exception may result in some or all of the source
+code used to create the kernel bundle being printed to the terminal.
+In situations where this is undesirable, developers must ensure that the
+exception is caught and handled appropriately.
+====
+
 Overload (2):
 
 _Constraints:_ Same as overload (1).
@@ -327,14 +336,14 @@ a!
 ----
 namespace sycl::ext::oneapi::experimental {
 
-struct build_log {
+struct save_log {
   std::string *log;
-  build_log(std::string *log);  (1)
+  save_log(std::string *to);  (1)
 };
-using build_log_key = build_log;
+using save_log_key = save_log;
 
 template<>
-struct is_property_key<build_log_key> : std::true_type {};
+struct is_property_key<save_log_key> : std::true_type {};
 
 } // namespace sycl::ext::oneapi::experimental {
 ----
@@ -347,15 +356,15 @@ build.
 When a build fails, an `exception` is thrown and the exception's `what` string
 provides a description of the error.
 
-Instead, the `build_log` property provides information about a build operation
+Instead, the `save_log` property provides information about a build operation
 that succeeds.
 This might include warning messages or other diagnostics.
 Each source language specification can define specific information that is
 provided in the log.
 In general, the log information is intended for human consumption, and the
 format may not be stable across implementations of this extension.
 
-_Effects (1):_ Constructs a `build_log` property with a pointer to a
+_Effects (1):_ Constructs a `save_log` property with a pointer to a
 `std::string`.
 When the `build` function completes successfully, this string will contain the
 log.