cmd/update: output more API information with --verbose.

Also, hide some spammy/unnecessary newline printing.

Library/Homebrew/cmd/update.sh

@@ -781,7 +781,6 @@ EOS
       export HOMEBREW_UPDATE_AFTER"${TAP_VAR}"="${CURRENT_REVISION}"
     else
       merge_or_rebase "${DIR}" "${TAP_VAR}" "${UPSTREAM_BRANCH}"
-      [[ -n "${HOMEBREW_VERBOSE}" ]] && echo
     fi
   done
 
@@ -799,6 +798,11 @@ EOS
         INITIAL_JSON_BYTESIZE="$(wc -c "${cache_path}")"
       fi
 
+      if [[ -n "${HOMEBREW_VERBOSE}" ]]
+      then
+        echo "Checking if we need to fetch ${filename}..."
+      fi
+
       JSON_URLS=()
       if [[ -n "${HOMEBREW_API_DOMAIN}" && "${HOMEBREW_API_DOMAIN}" != "${HOMEBREW_API_DEFAULT_DOMAIN}" ]]
       then
@@ -846,6 +850,11 @@ EOS
             rm -f "${api_cache}/formula_aliases.txt"
           fi
           HOMEBREW_UPDATED="1"
+
+          if [[ -n "${HOMEBREW_VERBOSE}" ]]
+          then
+            echo "Updated ${filename}."
+          fi
         fi
       else
         echo "Failed to download ${json_url}!" >>"${update_failed_file}"
@@ -855,6 +864,11 @@ EOS
 
     # Not a typo, these are the files we used to download that no longer need so should cleanup.
     rm -f "${HOMEBREW_CACHE}/api/formula.json" "${HOMEBREW_CACHE}/api/cask.json"
+  else
+    if [[ -n "${HOMEBREW_VERBOSE}" ]]
+    then
+      echo "HOMEBREW_NO_INSTALL_FROM_API set: skipping API JSON downloads."
+    fi
   fi
 
   if [[ -f "${update_failed_file}" ]]