docs: remove default iavl-cache-size invalid value (#14486)

server/config/config.go

@@ -260,7 +260,7 @@ func DefaultConfig() *Config {
 			PruningInterval:     "0",
 			MinRetainBlocks:     0,
 			IndexEvents:         make([]string, 0),
-			IAVLCacheSize:       781250, // 50 MB
+			IAVLCacheSize:       781250,
 			IAVLDisableFastNode: false,
 			AppDBBackend:        "",
 		},

server/config/toml.go

@@ -70,8 +70,7 @@ inter-block-cache = {{ .BaseConfig.InterBlockCache }}
 # ["message.sender", "message.recipient"]
 index-events = [{{ range .BaseConfig.IndexEvents }}{{ printf "%q, " . }}{{end}}]
 
-# IavlCacheSize set the size of the iavl tree cache. 
-# Default cache size is 50mb.
+# IavlCacheSize set the size of the iavl tree cache (in number of nodes).
 iavl-cache-size = {{ .BaseConfig.IAVLCacheSize }}
 
 # IAVLDisableFastNode enables or disables the fast node feature of IAVL.