Fix documentation warnings generated by JavaDoc (NFC) (#3428)

Some C++ Doxygen comments were updated to reflect any wording changes.

See `rg "(@return|@param \w+) TODO" | less` for list of incomplete docs.

ntcore/src/main/java/edu/wpi/first/networktables/NetworkTable.java

@@ -366,7 +366,11 @@ public final class NetworkTable {
     return getEntry(key).getValue();
   }
 
-  /** Get the path of the NetworkTable. */
+  /**
+   * Get the path of the NetworkTable.
+   *
+   * @return The path of the NetworkTable.
+   */
   public String getPath() {
     return m_path;
   }

ntcore/src/main/java/edu/wpi/first/networktables/NetworkTablesJNI.java

@@ -40,7 +40,11 @@ public final class NetworkTablesJNI {
     }
   }
 
-  /** Force load the library. */
+  /**
+   * Force load the library.
+   *
+   * @throws IOException if the library fails to load
+   */
   public static synchronized void forceLoad() throws IOException {
     if (libraryLoaded) {
       return;