better error msg (#78)

Author: AskAlexSharov

mdbx/error.go

@@ -77,7 +77,7 @@ const (
 const minErrno, maxErrno C.int = C.MDBX_KEYEXIST, C.MDBX_LAST_ADDED_ERRCODE
 
 // App can re-define this messages from init() func
-var CorruptErrorHardwareRecommendations = "Likely because hardware failure. Before creating issue please use tools like https://www.memtest86.com to test RAM and tools like https://www.smartmontools.org to test Disk. To handle hardware risks: use ECC RAM, use RAID of disks, run multiple application instances (or do backups). If hardware checks passed - check FS settings - 'fsync' and 'flock' must be enabled. "
+var CorruptErrorHardwareRecommendations = "Maybe free space is over on disk. Otherwise it's hardware failure. Before creating issue please use tools like https://www.memtest86.com to test RAM and tools like https://www.smartmontools.org to test Disk. To handle hardware risks: use ECC RAM, use RAID of disks, run multiple application instances (or do backups). If hardware checks passed - check FS settings - 'fsync' and 'flock' must be enabled. "
 var CorruptErrorBacktraceRecommendations = "Otherwise - please create issue in Application repo." // with backtrace or coredump. To create coredump set compile option 'MDBX_FORCE_ASSERTIONS=1' and env variable 'GOTRACEBACK=crash'."
 var CorruptErrorRecoveryRecommendations = "On default DURABLE mode, power outage can't cause this error. On other modes - power outage may break last transaction and mdbx_chk can recover db in this case, see '-t' and '-0|1|2' options."
 var CorruptErrorMessage = CorruptErrorHardwareRecommendations + " " + CorruptErrorBacktraceRecommendations + " " + CorruptErrorRecoveryRecommendations