Module api doc generator, fixing issue with negative lookback terminating at "." (#10832)

There is a little regex that wraps up all the free-floating functions in the doc-block
e.g. malloc() with backticks.
in case of `redis.call()`, it used to wrap just `call()` in backticks.

utils/generate-module-api-doc.rb

@@ -20,7 +20,7 @@ def markdown(s)
             # Add backquotes around RedisModule functions and type where missing.
             l = l.gsub(/(?<!`)RedisModule[A-z]+(?:\*?\(\))?/){|x| "`#{x}`"}
             # Add backquotes around c functions like malloc() where missing.
-            l = l.gsub(/(?<![`A-z])[a-z_]+\(\)/, '`\0`')
+            l = l.gsub(/(?<![`A-z.])[a-z_]+\(\)/, '`\0`')
             # Add backquotes around macro and var names containing underscores.
             l = l.gsub(/(?<![`A-z\*])[A-Za-z]+_[A-Za-z0-9_]+/){|x| "`#{x}`"}
             # Link URLs preceded by space or newline (not already linked)