fix: address code quality issues

- Remove unused variable 'after_colon'
- Extract common_words list to avoid long line
- Improve code readability

Author: mdlinville

src/lazydocs/generation.py

@@ -589,19 +589,18 @@ def _lines_isvalid(lines: list, start_index: int, blockindent: int,
                 # Check if the part before the colon contains URL indicators or 
                 # is likely descriptive text rather than an argument name
                 before_colon = match.group(1) if match else ""
-                after_colon = match.group(2) if match else ""
 
                 # Heuristics to detect non-argument lines:
                 # 1. The text before colon contains "http" (part of a URL)
                 # 2. The line contains "://" (URL protocol)
                 # 3. The text before colon is too long to be an argument name (>40 chars)
                 # 4. The text before colon contains common English words that aren't argument names
+                common_words = ["see", "to find", "refer", "documentation", "available"]
                 is_not_argument = (
                     "http" in before_colon.lower() or
                     "://" in line or
                     len(before_colon) > 40 or
-                    # Check for common descriptive phrases (without trailing space)
-                    any(word in before_colon.lower() for word in ["see", "to find", "refer", "documentation", "available"])
+                    any(word in before_colon.lower() for word in common_words)
                 )
 
                 if match and is_not_argument: