docs: update mdbook metrics info (#1119)

Co-authored-by: Marco Castelluccio <mcastelluccio@mozilla.com>

Author: miguelcsx

rust-code-analysis-book/src/commands/metrics.md

@@ -1,54 +1,45 @@
 # Metrics
 
-Metrics can be printed on screen or exported as different output formats
-through **rust-code-analysis-cli**.
+Metrics can be displayed or exported in various formats using **rust-code-analysis-cli**.
 
-## Print metrics
+## Display Metrics
 
-For each function space, **rust-code-analysis** computes the list of metrics
-described above. At the end of this process, **rust-code-analysis-cli**
-dumps the result formatted in a certain way on the screen.
-The command used to print the metrics is the following one:
+To compute and display metrics for a given file or directory, run:
 
-```console
+```bash
 rust-code-analysis-cli -m -p /path/to/your/file/or/directory
 ```
 
-The `-p` option represents the path to a file or a directory. If a directory is
-passed as input, **rust-code-analysis-cli** computes the metrics for each file
-contained in it.
+- `-p`: Path to the file or directory to analyze. If a directory is provided, metrics will be computed for all supported files it contains.
 
-## Export formats
+## Exporting Metrics
 
-Different output formats can be used to export metrics:
+**rust-code-analysis-cli** supports multiple output formats for exporting metrics, including:
 
-- Cbor
-- Json
-- Toml
-- Yaml
+- CBOR
+- JSON
+- TOML
+- YAML
 
-`Json` and `Toml` can also be exported pretty-printed.
+Both `JSON` and `TOML` can be exported as pretty-printed.
 
-### Export command
+### Export Command
 
-For example, if you want to export metrics as a `json` file, run:
+To export metrics as a JSON file:
 
-```console
-rust-code-analysis-cli -m -O json -o /output/path -p /path/to/your/file/or/directory
+```bash
+rust-code-analysis-cli -m -p /path/to/your/file/or/directory -O json -o /path/to/output/directory
 ```
 
-The `-O` option allows you to choose the output format. It supports
-**only** these values: *cbor*, *json*, *toml*, *yaml*.
+- `-O`: Specifies the output format (e.g., json, toml, yaml, cbor).
+- `-o`: Path to save the output file. The filename of the output file is the same as the input file plus the extension associated to the format. If not specified, the result will be printed in the shell. 
 
-The `-o` option is used to specify the path where your file will be saved.
-It accepts **only** paths. The filename of your output file is the same as
-your input file plus the extension associated to the format. When this option
-is not given, the output is printed on shell.
+### Pretty Print
 
-As we said before, `Json` and `Toml` can be exported as pretty-printed. To do
-so, the `--pr` option is used.
-In the case below, the pretty-printed `json` output will be printed on shell:
+To output pretty-printed JSON metrics:
 
-```console
-rust-code-analysis-cli -m -O json --pr -p /path/to/your/file/or/directory
+```bash
+rust-code-analysis-cli -m -p /path/to/your/file/or/directory --pr -O json
 ```
+
+This command prints the formatted metrics to the console or the specified output path.