Update docs: forge build specific paths and afterInvariant hook (#1222)

src/forge/invariant-testing.md

@@ -13,6 +13,8 @@ These and other invariant configuration aspects are explained [`here`](#configur
 
 Similar to how standard tests are run in Foundry by prefixing a function name with `test`, invariant tests are denoted by prefixing the function name with `invariant` (e.g., `function invariant_A()`).
 
+`afterInvariant()` function is called at the end of each invariant run (if declared), allowing post campaign processing. This function can be used for logging campaign metrics (e.g. how many times a selector was called) and post fuzz campaign testing (e.g. close out all positions and assert all funds are able to exit the system).
+
 ### Configuring invariant test execution
 
 Invariant tests execution is governed by parameters that can be controlled by users via Forge configuration primitives. Configs can be applied globally or on a per-test basis. For details on this topic please refer to

src/reference/forge/forge-build.md

@@ -23,6 +23,8 @@ it will download it and install it in `~/.svm`. You can disable this behavior by
 The build is incremental, and the build cache is saved in `cache/` in the project root by default. If you
 want to clear the cache, pass `--force`, and if you want to change the cache directory, pass `--cache-path <PATH>`.
 
+It is possible to choose sources to build by specifying multiple path options (can be paths to source directories or files).
+
 #### Build Modes
 
 There are three build modes:
@@ -183,6 +185,8 @@ The model checker will run when `forge build` is invoked, and will show findings
 `--skip`
 &nbsp;&nbsp;&nbsp;&nbsp;Skip compilation of non-essential contract directories like test or script (usage `--skip test`).
 
+`[PATHS]...`&nbsp;&nbsp;&nbsp;&nbsp;Build source files from specified paths.
+
 {{#include core-build-options.md}}
 
 {{#include watch-options.md}}
@@ -211,6 +215,11 @@ The model checker will run when `forge build` is invoked, and will show findings
     forge build --watch
     ```
 
+5. Build source files from `test/invariant` directory and `test/RegressionTest.sol`:
+    ```sh
+    forge build test/invariant test/RegressionTest.sol
+    ```
+
 ### SEE ALSO
 
 [forge](./forge.md), [forge clean](./forge-clean.md), [forge inspect](./forge-inspect.md)