Uniformize usage() and extra_usage() message ending for commands helper. (#8268)

# Description

Working on uniformizing the ending messages regarding methods usage()
and extra_usage(). This is related to the issue
https://github.com/nushell/nushell/issues/5066 after discussing it with
@jntrnr

# User-Facing Changes

None.

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-command/src/bytes/add.rs

@@ -49,7 +49,7 @@ impl Command for BytesAdd {
     }
 
     fn usage(&self) -> &str {
-        "Add specified bytes to the input"
+        "Add specified bytes to the input."
     }
 
     fn search_terms(&self) -> Vec<&str> {

crates/nu-command/src/bytes/bytes_.rs

@@ -20,7 +20,7 @@ impl Command for Bytes {
     }
 
     fn usage(&self) -> &str {
-        "Various commands for working with byte data"
+        "Various commands for working with byte data."
     }
 
     fn extra_usage(&self) -> &str {

crates/nu-command/src/bytes/collect.rs

@@ -26,7 +26,7 @@ impl Command for BytesCollect {
     }
 
     fn usage(&self) -> &str {
-        "Concatenate multiple binary into a single binary, with an optional separator between each"
+        "Concatenate multiple binary into a single binary, with an optional separator between each."
     }
 
     fn search_terms(&self) -> Vec<&str> {

crates/nu-command/src/bytes/ends_with.rs

@@ -39,7 +39,7 @@ impl Command for BytesEndsWith {
     }
 
     fn usage(&self) -> &str {
-        "Check if bytes ends with a pattern"
+        "Check if bytes ends with a pattern."
     }
 
     fn search_terms(&self) -> Vec<&str> {

crates/nu-command/src/bytes/index_of.rs

@@ -49,7 +49,7 @@ impl Command for BytesIndexOf {
     }
 
     fn usage(&self) -> &str {
-        "Returns start index of first occurrence of pattern in bytes, or -1 if no match"
+        "Returns start index of first occurrence of pattern in bytes, or -1 if no match."
     }
 
     fn search_terms(&self) -> Vec<&str> {

crates/nu-command/src/bytes/length.rs

@@ -27,7 +27,7 @@ impl Command for BytesLen {
     }
 
     fn usage(&self) -> &str {
-        "Output the length of any bytes in the pipeline"
+        "Output the length of any bytes in the pipeline."
     }
 
     fn search_terms(&self) -> Vec<&str> {

crates/nu-command/src/bytes/remove.rs

@@ -43,7 +43,7 @@ impl Command for BytesRemove {
     }
 
     fn usage(&self) -> &str {
-        "Remove bytes"
+        "Remove bytes."
     }
 
     fn search_terms(&self) -> Vec<&str> {

crates/nu-command/src/bytes/replace.rs

@@ -43,7 +43,7 @@ impl Command for BytesReplace {
     }
 
     fn usage(&self) -> &str {
-        "Find and replace binary"
+        "Find and replace binary."
     }
 
     fn search_terms(&self) -> Vec<&str> {

crates/nu-command/src/bytes/reverse.rs

@@ -27,7 +27,7 @@ impl Command for BytesReverse {
     }
 
     fn usage(&self) -> &str {
-        "Reverse the bytes in the pipeline"
+        "Reverse the bytes in the pipeline."
     }
 
     fn search_terms(&self) -> Vec<&str> {

crates/nu-command/src/bytes/starts_with.rs

@@ -40,7 +40,7 @@ impl Command for BytesStartsWith {
     }
 
     fn usage(&self) -> &str {
-        "Check if bytes starts with a pattern"
+        "Check if bytes starts with a pattern."
     }
 
     fn search_terms(&self) -> Vec<&str> {