Add the notes for episode 13

docs/videos.org

@@ -563,6 +563,24 @@ and tries to =resolve= *undefined* symbols
 ** Resources:
 - [[https://lwn.net/Articles/276782/][20 part linker essay]]
 * Episode 13 - Source Manager
+** LLVM Meetup 2021
+*** Tons of amazing talks
+*** The community is expanding
+- A screencast on how to get started with a FOSS project
+
 ** Updates:
+- Still JIT
+- We're going to start the JIT discussion from next EP
+
 ** Forgot to show case the code generation
 I didn't show it in action
+
+** What is a source manager
+- It owns and manages are the source buffers
+- All of our interactions with source files will happen though Source manager
+  - Including reading files
+  - Loading namespaces
+  - Including namespaces
+  - ...
+
+- LLVM provides a =SourceMgr= class that we're not using it

include/serene/source_mgr.h

@@ -42,7 +42,7 @@ class SereneContext;
 
 /// This class is quite similar to the `llvm::SourceMgr` in functionality. We
 /// even borrowed some of the code from the original implementation but removed
-/// a lot of code that ar irrelevant to us.
+/// a lot of code that were irrelevant to us.
 ///
 /// SouceMgr is responsible for finding a namespace in the `loadPaths` and read
 /// the content of the `.srn` (or any of the `DEFAULT_SUFFIX`) into a
@@ -80,7 +80,7 @@ private:
     /// dynamically based on the size of Buffer.
     mutable void *offsetCache = nullptr;
 
-    /// Look up a given \p Ptr in in the buffer, determining which line it came
+    /// Look up a given \p ptr in in the buffer, determining which line it came
     /// from.
     unsigned getLineNumber(const char *ptr) const;
     template <typename T>