chore: fix some typos in comment (#15877)

### What does this PR try to resolve?

fix some typos in comment

### How to test and review this PR?

No need.

Author: epage

src/cargo/core/manifest.rs

@@ -1086,7 +1086,7 @@ impl Target {
         *self.kind() == TargetKind::CustomBuild
     }
 
-    /// Returns `true` if it is a compile time depencencies, e.g., build script or proc macro
+    /// Returns `true` if it is a compile time dependencies, e.g., build script or proc macro
     pub fn is_compile_time_dependency(&self) -> bool {
         self.is_custom_build() || self.proc_macro()
     }

src/doc/src/reference/build-cache.md

@@ -7,7 +7,7 @@ both directories point to a directory named `target` in the root of your
 value, or the `--target-dir` command-line flag. To change the location of the build-dir, you can set the
 `CARGO_BUILD_BUILD_DIR` [environment variable] or the [`build.build-dir`] config value.
 
-Artifacts are split in two catagories:
+Artifacts are split in two categories:
 * Final build artifacts
   * Final build artifacts are output meant for end users of Cargo
   * e.g. binaries for bin crates, output of `cargo doc`, Cargo `--timings` reports