chore: fix some typos in comments (#589)

Signed-off-by: gopherorg <gopherworld@icloud.com>

backend/telemetry_core/src/main.rs

@@ -45,7 +45,7 @@ const VERSION: &str = env!("CARGO_PKG_VERSION");
 const AUTHORS: &str = env!("CARGO_PKG_AUTHORS");
 const NAME: &str = "Substrate Telemetry Backend Core";
 const ABOUT: &str = "This is the Telemetry Backend Core that receives telemetry messages \
-                     from Substrate/Polkadot nodes and provides the data to a subsribed feed";
+                     from Substrate/Polkadot nodes and provides the data to a subscribed feed";
 
 #[derive(StructOpt, Debug)]
 #[structopt(name = NAME, version = VERSION, author = AUTHORS, about = ABOUT)]

backend/telemetry_shard/src/json_message/hash.rs

@@ -50,7 +50,7 @@ impl<'de> Visitor<'de> for HashVisitor {
 
     fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
         formatter.write_str(
-            "byte array of length 32, or hexidecimal string of 32 bytes beginning with 0x",
+            "byte array of length 32, or hexadecimal string of 32 bytes beginning with 0x",
         )
     }
 

backend/telemetry_shard/src/real_ip.rs

@@ -114,7 +114,7 @@ fn pick_best_ip_from_options(
 /// Follow <https://datatracker.ietf.org/doc/html/rfc7239> to decode the Forwarded header value.
 /// Roughly, proxies can add new sets of values by appending a comma to the existing list
 /// (so we have something like "values1, values2, values3" from proxy1, proxy2 and proxy3 for
-/// instance) and then the valeus themselves are ';' separated name=value pairs. The value in each
+/// instance) and then the values themselves are ';' separated name=value pairs. The value in each
 /// pair may or may not be surrounded in double quotes.
 ///
 /// Examples from the RFC:

backend/test_utils/src/lib.rs

@@ -21,7 +21,7 @@ pub mod server;
 /// is the slightly-lossy inverse of the custom serialization we do to feed messages.
 pub mod feed_message_de;
 
-/// A couple of macros to make it easier to test for the presense of things (mainly, feed messages)
+/// A couple of macros to make it easier to test for the presence of things (mainly, feed messages)
 /// in an iterable container.
 #[macro_use]
 pub mod contains_matches;