Clarify that program build callbacks can query build status (#285)

* Clarify that program build callbacks can query build status

Fixes #274

* Further clarification

* Generalize statement about program queries

api/opencl_runtime_layer.asciidoc

@@ -5867,6 +5867,9 @@ include::{generated}/api/version-notes/clBuildProgram.asciidoc[]
     If _pfn_notify_ is not `NULL`, {clBuildProgram} does not need to wait for
     the build to complete and can return immediately once the build operation
     can begin.
+    Any state changes of the program object that result from calling
+    {clBuildProgram} (e.g. build status or log) will be observable from this
+    callback function.
     The build operation can begin if the context, program whose sources are
     being compiled and linked, list of devices and build options specified are
     all valid and appropriate host and device resources needed to perform the
@@ -6002,6 +6005,9 @@ include::{generated}/api/version-notes/clCompileProgram.asciidoc[]
     If _pfn_notify_ is not `NULL`, {clCompileProgram} does not need to wait for
     the compiler to complete and can return immediately once the compilation can
     begin.
+    Any state changes of the program object that result from calling
+    {clCompileProgram} (e.g. compile status or log) will be observable from this
+    callback function.
     The compilation can begin if the context, program whose sources are being
     compiled, list of devices, input headers, programs that describe input
     headers and compiler options specified are all valid and appropriate host
@@ -6161,7 +6167,8 @@ linker to complete, and can return immediately once the linking operation can
 begin.
 Once the linker has completed, the _pfn_notify_ callback function is called
 which returns the program object returned by {clLinkProgram}.
-The application can query the link status and log for this program object.
+Any state changes of the program object that result from calling {clLinkProgram}
+(e.g. link status or log) will be observable from this callback function.
 This callback function may be called asynchronously by the OpenCL
 implementation.
 It is the applications responsibility to ensure that the callback function