Merge pull request #1598 from skliper/fix1299-fs_rtn_codes

Fix #1299, Updated FS Read/WriteHeader API return documentation

modules/core_api/fsw/inc/cfe_fs.h

@@ -64,7 +64,7 @@
 ** \param[in] FileDes      File Descriptor obtained from a previous call to #OS_OpenCreate
 **                         that is associated with the file whose header is to be read.
 **
-** \return Execution status, see \ref CFEReturnCodes
+** \return Bytes read or error status, see \ref CFEReturnCodes
 **
 ** \sa #CFE_FS_WriteHeader
 **
@@ -124,7 +124,7 @@ void CFE_FS_InitHeader(CFE_FS_Header_t *Hdr, const char *Description, uint32 Sub
 **                         filled with the contents of the Standard cFE File Header. *Hdr is the contents of the
 **                         Standard cFE File Header for the specified file.
 **
-** \return Execution status, see \ref CFEReturnCodes
+** \return Bytes written or error status, see \ref CFEReturnCodes
 **
 ** \sa #CFE_FS_ReadHeader
 **