[Developer's Manual] Updated links and fixed typos (#199)
diff --git a/docs/postgres/node.md b/docs/postgres/node.md
index 53d8bde..b125443 100644
--- a/docs/postgres/node.md
+++ b/docs/postgres/node.md
@@ -2,7 +2,7 @@
## Overview
-Postgres has a default struct that it uses for throughout most of its query processing engine, <a href='https://github.com/postgres/postgres/blob/master/src/include/nodes/nodes.h#L105'>Node</a>. The Node struct is defined as follows:
+Postgres has a default struct that it uses for throughout most of its query processing engine, <a href='https://github.com/postgres/postgres/blob/7ef5f5fb324096c7822c922ad59fd7fdd76f57b1/src/include/nodes/nodes.h#L128'>Node</a>. The Node struct is defined as follows:
```c
typedef struct Node
@@ -94,7 +94,7 @@
## How Postgres Uses Structs and Pointers
-Void pointers assume nothing about what the pointer is referencing. The Node struct on the other hand know about one field the <a href='https://github.com/postgres/postgres/blob/REL_11_17/src/include/nodes/nodes.h#L26'>enum NodeType</a>. Nearly all the postgres data structures used in the query processing engine start with this field.
+Void pointers assume nothing about what the pointer is referencing. The Node struct on the other hand know about one field the <a href='https://github.com/postgres/postgres/blob/REL_11_17/src/include/nodes/nodes.h#L26'>enum NodeTag</a>. Nearly all the postgres data structures used in the query processing engine start with this field.
For example, here is the data structure that represents a function call in the parser phase:
diff --git a/docs/postgres/pg_function_info.md b/docs/postgres/pg_function_info.md
index b91857e..31904fa 100644
--- a/docs/postgres/pg_function_info.md
+++ b/docs/postgres/pg_function_info.md
@@ -62,7 +62,7 @@
typedef struct FunctionCallInfoData *FunctionCallInfo;
```
-FunctionCallInfoData contains the contextual information that a function needs to execute.
+<a href='https://github.com/postgres/postgres/blob/eafe9c9181a4fd4b68d7e22e979de839cc16930c/src/include/fmgr.h#L77'>FunctionCallInfoData</a> contains the contextual information that a function needs to execute.
```c
