[mlir] NFC: Fix broken links in docs

Summary: This commit fixes missing links that are caused by the repository movement.

Reviewers: Jim, rriddle, jpienaar

Reviewed By: Jim, rriddle, jpienaar

Subscribers: arpith-jacob, mehdi_amini, rriddle, jpienaar, burmako, shauheen, antiagainst, nicolasvasilache, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D72065

mlir/docs/DeclarativeRewrites.md

@@ -687,4 +687,4 @@ deduction ability. See [building operations](#building-operations) for more
 details.
 
 [TableGen]: https://llvm.org/docs/TableGen/index.html
-[OpBase]: https://github.com/tensorflow/mlir/blob/master/include/mlir/IR/OpBase.td
+[OpBase]: https://github.com/llvm/llvm-project/blob/master/mlir/include/mlir/IR/OpBase.td

mlir/docs/DefiningAttributesAndTypes.md

@@ -24,7 +24,7 @@ efficient([rationale](Rationale.md#reserving-dialect-type-kinds). For a dialect
 author, this means that a range of type `kind` values must be explicitly, and
 statically, reserved. A dialect can reserve a range of values by adding a new
 entry to the
-[DialectSymbolRegistry](https://github.com/tensorflow/mlir/blob/master/include/mlir/IR/DialectSymbolRegistry.def).
+[DialectSymbolRegistry](https://github.com/llvm/llvm-project/blob/master/mlir/include/mlir/IR/DialectSymbolRegistry.def).
 To support out-of-tree and experimental dialects, the registry predefines a set
 of privates ranges, `PRIVATE_EXPERIMENTAL_[0-9]`, that are free for immediate
 use.

mlir/docs/LangRef.md

@@ -13,7 +13,7 @@ high-performance target-specific code.
 
 This document defines and describes the key concepts in MLIR, and is intended to
 be a dry reference document - the [rationale documentation](Rationale.md),
-[glossary](Glossary.md), and other content are hosted elsewhere.
+[glossary](https://mlir.llvm.org/getting_started/Glossary/), and other content are hosted elsewhere.
 
 MLIR is designed to be used in three different forms: a human-readable textual
 form suitable for debugging, an in-memory form suitable for programmatic
@@ -1455,7 +1455,7 @@ This attribute can only be held internally by
 attribute dictionary), i.e. no other attribute kinds such as Locations or
 extended attribute kinds. If a reference to a symbol is necessary from outside
 of the symbol table that the symbol is defined in, a
-[string attribute](string-attribute) can be used to refer to the symbol name.
+[string attribute](#string-attribute) can be used to refer to the symbol name.
 
 **Rationale:** Given that MLIR models global accesses with symbol references, to
 enable efficient multi-threading, it becomes difficult to effectively reason

mlir/docs/OpDefinitions.md

@@ -1203,8 +1203,8 @@ arbitrary computations needed to specify output shapes.
 [TableGenIntro]: https://llvm.org/docs/TableGen/LangIntro.html
 [TableGenRef]: https://llvm.org/docs/TableGen/LangRef.html
 [TableGenBackend]: https://llvm.org/docs/TableGen/BackEnds.html#introduction
-[OpBase]: https://github.com/tensorflow/mlir/blob/master/include/mlir/IR/OpBase.td
-[OpDefinitionsGen]: https://github.com/tensorflow/mlir/blob/master/tools/mlir-tblgen/OpDefinitionsGen.cpp
-[EnumsGen]: https://github.com/tensorflow/mlir/blob/master/tools/mlir-tblgen/EnumsGen.cpp
-[StringAttr]: https://github.com/tensorflow/mlir/blob/master/g3doc/LangRef.md#string-attribute
-[IntegerAttr]: https://github.com/tensorflow/mlir/blob/master/g3doc/LangRef.md#integer-attribute
+[OpBase]: ../include/mlir/IR/OpBase.td
+[OpDefinitionsGen]: ../tools/mlir-tblgen/OpDefinitionsGen.cpp
+[EnumsGen]: ../tools/mlir-tblgen/EnumsGen.cpp
+[StringAttr]: LangRef.md#string-attribute
+[IntegerAttr]: LangRef.md#integer-attribute