fix: typos in the documentation (#472)

* fix typo 0001-add-support-to-save-fee-estimates-without-shutting-d.patch

* fix typo runit_boot.sh

contrib/0001-add-support-to-save-fee-estimates-without-shutting-d.patch

@@ -149,7 +149,7 @@ index 000000000..c6d82345b
 +  - call the savefeeestimates RPC and verify the RPC succeeds and
 +    that the file exists
 +  - make the file read only and attempt to call the savefeeestimates RPC
-+    with the expecation that it will fail
++    with the expectation that it will fail
 +  - move the read only file and shut down the node, verify the node writes
 +    on shutdown a file that is identical to the one we saved via the RPC
 +

contrib/runit_boot.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 shutdown() {
-  echo "shutting down container"
+  echo "shutting down the container"
 
   # first shutdown any service started by runit
   for _srv in $(ls -1 /etc/service); do
@@ -22,7 +22,7 @@ shutdown() {
   exit
 }
 
-# store enviroment variables
+# store environment variables
 export > /etc/envvars
 
 PATH=/usr/local/bin:/usr/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/X11R6/bin