Update samples

samples/daemontools/env/HIST_MB

@@ -1 +0,0 @@
-300

samples/daemontools/env/UTXO_MB

@@ -1 +0,0 @@
-1000

samples/systemd/electrumx.conf

@@ -65,31 +65,3 @@
         #Maximum number of address subscriptions across all sessions
     #MAX_SESSION_SUBS = 50000
         #Maximum number of address subscriptions permitted to a single session.
-
-
-#If synchronizing from the Genesis block your performance might change
-#by tweaking the following cache variables.  Cache size is only checked
-#roughly every minute, so the caches can grow beyond the specified
-#size.  Also the Python process is often quite a bit fatter than the
-#combined cache size, because of Python overhead and also because
-#leveldb consumes a lot of memory during UTXO flushing.  So I recommend
-#you set the sum of these to nothing over half your available physical
-#RAM:
-
-    #HIST_MB = 300
-        #amount of history cache, in MB, to retain before flushing to
-        #disk.  Default is 300; probably no benefit being much larger
-        #as history is append-only and not searched.
-
-    #UTXO_MB = 1000
-       #amount of UTXO and history cache, in MB, to retain before
-       #flushing to disk.  Default is 1000.  This may be too large
-       #for small boxes or too small for machines with lots of RAM.
-       #Larger caches generally perform better as there is
-       #significant searching of the UTXO cache during indexing.
-       #However, I don't see much benefit in my tests pushing this
-       #too high, and in fact performance begins to fall.  My
-       #machine has 24GB RAM; the slow down is probably because of
-       #leveldb caching and Python GC effects.  However this may be
-       #very dependent on hardware and you may have different
-       #results.