Node: fix typos in help pages

src/node/main/node_config_command.ml

@@ -113,11 +113,11 @@ module Manpage = struct
         factory default one. \
         If additional command-line arguments are provided, \
         they will amend the generated file. \
-        It assumes that a configuration file already exists, \
+        It assumes that a configuration file already exists \
         and will abort otherwise." ;
     `P "$(b,init) is like reset but assumes that \
-        no configuration file is present, \
-        and will abort other otherwise." ;
+        no configuration file is present \
+        and will abort otherwise." ;
     `P "$(b,update) is the main option to edit the configuration file of Tezos. \
         It will parse command line arguments and add or replace corresponding \
         entries in the Tezos configuration file."

src/node/main/node_identity_command.ml

@@ -97,7 +97,7 @@ module Term = struct
     let doc =
       "Expected amount of proof-of-work for the node identity. \
        The optional parameter should be a float between 0 and 256, where
-       0 disable the proof-of-work mechanism." in
+       0 disables the proof-of-work mechanism." in
     Arg.(value & pos 1 (some float) None & info [] ~docv:"DIFFICULTY" ~doc)
 
   let term =
@@ -128,7 +128,7 @@ module Manpage = struct
         This is the default operation." ;
     `P "$(b,generate [difficulty]) generates an identity whose \
         proof of work stamp difficulty is at least equal to $(i,difficulty). \
-        The value provided must be a floating point number between 0 and 128. \
+        The value provided must be a floating point number between 0 and 256. \
         It roughly reflects the numbers of expected leading zeroes in the hash \
         of the identity data-structure. \
         Therefore, a value of 0 means no proof-of-work, and the difficulty \