docs: improve bash and grep tool documentation with clearer usage guidelines

packages/opencode/src/tool/grep.txt

@@ -2,7 +2,7 @@
 - Searches file contents using regular expressions
 - Supports full regex syntax (eg. "log.*Error", "function\s+\w+", etc.)
 - Filter files by pattern with the include parameter (eg. "*.js", "*.{ts,tsx}")
-- Returns file paths with at least one match sorted by modification time
+- Returns file paths and line numbers with at least one match sorted by modification time
 - Use this tool when you need to find files containing specific patterns
 - If you need to identify/count the number of matches within files, use the Bash tool with `rg` (ripgrep) directly. Do NOT use `grep`.
 - When you are doing an open ended search that may require multiple rounds of globbing and grepping, use the Task tool instead